Build(deps): Bump sphinx-rtd-theme in /dependencies/docs

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]>

Author: dependabot[bot]

dependencies/docs/constraints.txt

@@ -12,7 +12,7 @@ Pygments==2.18.0
 requests==2.32.3
 snowballstemmer==2.2.0
 Sphinx==7.4.7
-sphinx-rtd-theme==2.0.0
+sphinx-rtd-theme==3.0.0
 sphinxcontrib-applehelp==2.0.0
 sphinxcontrib-devhelp==2.0.0
 sphinxcontrib-htmlhelp==2.1.0