Build(deps): Bump sphinx-rtd-theme from 3.0.2 to 3.1.0

Bumps [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) from 3.0.2 to 3.1.0.
- [Changelog](https://github.com/readthedocs/sphinx_rtd_theme/blob/master/docs/changelog.rst)
- [Commits](readthedocs/sphinx_rtd_theme@3.0.2...3.1.0)

---
updated-dependencies:
- dependency-name: sphinx-rtd-theme
  dependency-version: 3.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

constraints.txt

@@ -49,7 +49,7 @@ setuptools-scm==9.2.2
 snowballstemmer==3.0.1
 sortedcontainers==2.4.0
 Sphinx==8.1.3
-sphinx-rtd-theme==3.0.2
+sphinx-rtd-theme==3.1.0
 sphinxcontrib-applehelp==2.0.0
 sphinxcontrib-devhelp==2.0.0
 sphinxcontrib-htmlhelp==2.1.0