fix: bump release-please from 15.1.2 to 15.7.0 (#714)

Fixes #713 

Bumps [release-please](https://github.com/googleapis/release-please)
from 15.1.2 to 15.7.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/googleapis/release-please/releases">release-please's
releases</a>.</em></p>
<blockquote>
<h2>v15.7.0</h2>
<h2><a
href="https://github.com/googleapis/release-please/compare/v15.6.0...v15.7.0">15.7.0</a>
(2023-02-07)</h2>
<h3>Features</h3>
<ul>
<li><strong>changelog.json:</strong> Implement changelog.json for python
(<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1841">#1841</a>)
(<a
href="https://github.com/googleapis/release-please/commit/52594b194fdd0ae516776128e6511d5e4cd21518">52594b1</a>)</li>
</ul>
<h2>v15.6.0</h2>
<h2><a
href="https://github.com/googleapis/release-please/compare/v15.5.1...v15.6.0">15.6.0</a>
(2023-02-01)</h2>
<h3>Features</h3>
<ul>
<li><strong>changelog.json:</strong> Add pr suffix to issues array (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1839">#1839</a>)
(<a
href="https://github.com/googleapis/release-please/commit/fdd75efbc276d432f1d9d54f1790f4852a4aa3f7">fdd75ef</a>)</li>
</ul>
<h2>v15.5.1</h2>
<h2><a
href="https://github.com/googleapis/release-please/compare/v15.5.0...v15.5.1">15.5.1</a>
(2023-01-30)</h2>
<h3>Bug Fixes</h3>
<ul>
<li>Support TOML up to v1.0.0-rc.1 spec. (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1837">#1837</a>)
(<a
href="https://github.com/googleapis/release-please/commit/a3d94eec209e00b6f513caa379096d082af7a72b">a3d94ee</a>)</li>
</ul>
<h2>v15.5.0</h2>
<h2><a
href="https://github.com/googleapis/release-please/compare/v15.4.0...v15.5.0">15.5.0</a>
(2023-01-27)</h2>
<h3>Features</h3>
<ul>
<li>Add generic TOML updater (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1833">#1833</a>)
(<a
href="https://github.com/googleapis/release-please/commit/2768a4cfe131ac8493447a8c7512c623c200df34">2768a4c</a>)</li>
<li>Add toml generic updater option to extra-files schema (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1835">#1835</a>)
(<a
href="https://github.com/googleapis/release-please/commit/9240f71c21f077b240d2ce186456fb23b50dfd89">9240f71</a>)</li>
</ul>
<h2>v15.4.0</h2>
<h2><a
href="https://github.com/googleapis/release-please/compare/v15.3.1...v15.4.0">15.4.0</a>
(2023-01-26)</h2>
<h3>Features</h3>
<ul>
<li><strong>changelog.json:</strong> Include referenced issues/prs (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1830">#1830</a>)
(<a
href="https://github.com/googleapis/release-please/commit/bacbbb52ad802d42af1ffb40e8c616cc6c6601a6">bacbbb5</a>)</li>
</ul>
<h2>v15.3.1</h2>
<h2><a
href="https://github.com/googleapis/release-please/compare/v15.3.0...v15.3.1">15.3.1</a>
(2023-01-26)</h2>
<h3>Bug Fixes</h3>
<ul>
<li>Filter changelog.json commits based on changelog sections (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1827">#1827</a>)
(<a
href="https://github.com/googleapis/release-please/commit/844aacd76434ae288ee3ac9b2061dd9406e99bd8">844aacd</a>)</li>
</ul>
<h2>v15.3.0</h2>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/googleapis/release-please/blob/main/CHANGELOG.md">release-please's
changelog</a>.</em></p>
<blockquote>
<h2><a
href="https://github.com/googleapis/release-please/compare/v15.6.0...v15.7.0">15.7.0</a>
(2023-02-07)</h2>
<h3>Features</h3>
<ul>
<li><strong>changelog.json:</strong> Implement changelog.json for python
(<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1841">#1841</a>)
(<a
href="https://github.com/googleapis/release-please/commit/52594b194fdd0ae516776128e6511d5e4cd21518">52594b1</a>)</li>
</ul>
<h2><a
href="https://github.com/googleapis/release-please/compare/v15.5.1...v15.6.0">15.6.0</a>
(2023-02-01)</h2>
<h3>Features</h3>
<ul>
<li><strong>changelog.json:</strong> Add pr suffix to issues array (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1839">#1839</a>)
(<a
href="https://github.com/googleapis/release-please/commit/fdd75efbc276d432f1d9d54f1790f4852a4aa3f7">fdd75ef</a>)</li>
</ul>
<h2><a
href="https://github.com/googleapis/release-please/compare/v15.5.0...v15.5.1">15.5.1</a>
(2023-01-30)</h2>
<h3>Bug Fixes</h3>
<ul>
<li>Support TOML up to v1.0.0-rc.1 spec. (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1837">#1837</a>)
(<a
href="https://github.com/googleapis/release-please/commit/a3d94eec209e00b6f513caa379096d082af7a72b">a3d94ee</a>)</li>
</ul>
<h2><a
href="https://github.com/googleapis/release-please/compare/v15.4.0...v15.5.0">15.5.0</a>
(2023-01-27)</h2>
<h3>Features</h3>
<ul>
<li>Add generic TOML updater (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1833">#1833</a>)
(<a
href="https://github.com/googleapis/release-please/commit/2768a4cfe131ac8493447a8c7512c623c200df34">2768a4c</a>)</li>
<li>Add toml generic updater option to extra-files schema (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1835">#1835</a>)
(<a
href="https://github.com/googleapis/release-please/commit/9240f71c21f077b240d2ce186456fb23b50dfd89">9240f71</a>)</li>
</ul>
<h2><a
href="https://github.com/googleapis/release-please/compare/v15.3.1...v15.4.0">15.4.0</a>
(2023-01-26)</h2>
<h3>Features</h3>
<ul>
<li><strong>changelog.json:</strong> Include referenced issues/prs (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1830">#1830</a>)
(<a
href="https://github.com/googleapis/release-please/commit/bacbbb52ad802d42af1ffb40e8c616cc6c6601a6">bacbbb5</a>)</li>
</ul>
<h2><a
href="https://github.com/googleapis/release-please/compare/v15.3.0...v15.3.1">15.3.1</a>
(2023-01-26)</h2>
<h3>Bug Fixes</h3>
<ul>
<li>Filter changelog.json commits based on changelog sections (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1827">#1827</a>)
(<a
href="https://github.com/googleapis/release-please/commit/844aacd76434ae288ee3ac9b2061dd9406e99bd8">844aacd</a>)</li>
</ul>
<h2><a
href="https://github.com/googleapis/release-please/compare/v15.2.0...v15.3.0">15.3.0</a>
(2023-01-25)</h2>
<h3>Features</h3>
<ul>
<li>Add Salesforce strategy (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1815">#1815</a>)
(<a
href="https://github.com/googleapis/release-please/commit/25b518f4f34afcd749968d021f4eed99222a328a">25b518f</a>)</li>
<li>Add support for yarn workspace versions (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1819">#1819</a>)
(<a
href="https://github.com/googleapis/release-please/commit/8b0cc7d7d203609c95e9e7cfbef4f0faedd3f46d">8b0cc7d</a>)</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/googleapis/release-please/commit/b57b5589892e87f034cb2a21fbab5db959c5b2c2"><code>b57b558</code></a>
chore(main): release 15.7.0 (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1847">#1847</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/52594b194fdd0ae516776128e6511d5e4cd21518"><code>52594b1</code></a>
feat(changelog.json): implement changelog.json for python (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1841">#1841</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/1493bd7896ff51b9b3d51c65faae37b69ba2044a"><code>1493bd7</code></a>
chore(main): release 15.6.0 (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1840">#1840</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/fdd75efbc276d432f1d9d54f1790f4852a4aa3f7"><code>fdd75ef</code></a>
feat(changelog.json): add pr suffix to issues array (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1839">#1839</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/7f2d31b898a456423a58e1861a870499830bf8f8"><code>7f2d31b</code></a>
chore(main): release 15.5.1 (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1838">#1838</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/a3d94eec209e00b6f513caa379096d082af7a72b"><code>a3d94ee</code></a>
fix: Support TOML up to v1.0.0-rc.1 spec. (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1837">#1837</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/fa92311327c24adbdf1613aa3cdbb7bb28f5748c"><code>fa92311</code></a>
chore(main): release 15.5.0 (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1834">#1834</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/9240f71c21f077b240d2ce186456fb23b50dfd89"><code>9240f71</code></a>
feat: add toml generic updater option to extra-files schema (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1835">#1835</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/2768a4cfe131ac8493447a8c7512c623c200df34"><code>2768a4c</code></a>
feat: Add generic TOML updater (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1833">#1833</a>)</li>
<li><a
href="https://github.com/googleapis/release-please/commit/bee55967e0033ddef699c66367c15b95f4a38f16"><code>bee5596</code></a>
chore(main): release 15.4.0 (<a
href="https://github-redirect.dependabot.com/googleapis/release-please/issues/1831">#1831</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/googleapis/release-please/compare/v15.1.2...v15.7.0">compare
view</a></li>
</ul>
</details>
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