Bump sphinx-rtd-theme from 2.0.0 to 3.0.0

Bumps [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) from 2.0.0 to 3.0.0.
- [Changelog](https://github.com/readthedocs/sphinx_rtd_theme/blob/master/docs/changelog.rst)
- [Commits](readthedocs/sphinx_rtd_theme@2.0.0...3.0.0)

---
updated-dependencies:
- dependency-name: sphinx-rtd-theme
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

docs/requirements.txt

@@ -1,5 +1,5 @@
 Sphinx==7.4.4
-sphinx_rtd_theme==2.0.0
+sphinx_rtd_theme==3.0.0
 docutils==0.20.1
 sphinxcontrib-httpdomain==1.8.1
 sphinx-github-changelog==1.4.0