Bump rpds-py from 0.20.1 to 0.21.0 in /api (#323)

Bumps [rpds-py](https://github.com/crate-py/rpds) from 0.20.1 to 0.21.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/crate-py/rpds/releases">rpds-py's
releases</a>.</em></p>
<blockquote>
<h2>v0.21.0</h2>
<!-- raw HTML omitted -->
<h2>What's Changed</h2>
<ul>
<li>bump pyO3 to 0.22.6 by <a
href="https://github.com/minrk"><code>@​minrk</code></a> in <a
href="https://redirect.github.com/crate-py/rpds/pull/97">crate-py/rpds#97</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a href="https://github.com/minrk"><code>@​minrk</code></a> made
their first contribution in <a
href="https://redirect.github.com/crate-py/rpds/pull/97">crate-py/rpds#97</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/crate-py/rpds/compare/v0.20.1...v0.21.0">https://github.com/crate-py/rpds/compare/v0.20.1...v0.21.0</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/crate-py/rpds/commit/73581d8dfc56a24eac6ee32c83e6759b4506bb71"><code>73581d8</code></a>
Release v0.21.0</li>
<li><a
href="https://github.com/crate-py/rpds/commit/32c53dcabf8d44430a51a5a62ad309d0b2c214d5"><code>32c53dc</code></a>
Oh hello there zizmor.</li>
<li><a
href="https://github.com/crate-py/rpds/commit/da707ab4f460148330a90e9cf656f7cefab4c6f2"><code>da707ab</code></a>
Add a link to the upstream repo.</li>
<li><a
href="https://github.com/crate-py/rpds/commit/30de85b475ea1f3e72de83c86eaa2a88b22a58a7"><code>30de85b</code></a>
The packaging docs apparently discourage license.</li>
<li><a
href="https://github.com/crate-py/rpds/commit/e39adf880947066d2b7f21a3b5aec09901e762d3"><code>e39adf8</code></a>
Merge pull request <a
href="https://redirect.github.com/crate-py/rpds/issues/97">#97</a> from
minrk/pyo3-bump</li>
<li><a
href="https://github.com/crate-py/rpds/commit/c0f173e3f257be85d936559a999bd947639a171b"><code>c0f173e</code></a>
bump pyO3 to 0.22.6</li>
<li><a
href="https://github.com/crate-py/rpds/commit/de9cf8d770c4ab4b9aa232ace9b3252df22323eb"><code>de9cf8d</code></a>
Update requirements.</li>
<li><a
href="https://github.com/crate-py/rpds/commit/f949b5bf80c0e516ba5d4a47075bcaf5fb2d4a67"><code>f949b5b</code></a>
Drop support for 3.8, which is EOL.</li>
<li>See full diff in <a
href="https://github.com/crate-py/rpds/compare/v0.20.1...v0.21.0">compare
view</a></li>
</ul>
</details>
<br />


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api/requirements.txt

@@ -33,7 +33,7 @@ rackit @ git+https://github.com/stackhpc/rackit.git@cb2da480f9fc99f36cc777d58dfb
 referencing==0.35.1
 requests==2.32.3
 rfc3986==2.0.0
-rpds-py==0.20.1
+rpds-py==0.21.0
 six==1.16.0
 sniffio==1.3.1
 sqlparse==0.5.1