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] <support@github.com>

Author: dependabot[bot]

documentation-requirements.txt

@@ -5,7 +5,7 @@ sphinx-autodoc-typehints==3.1.0
 sphinx-gallery==0.19.0
 sphinx-jinja2-compat==0.3.0
 sphinx-prompt==1.9.0
-sphinx-rtd-theme==3.0.2
+sphinx-rtd-theme==3.1.0
 sphinx-tabs==3.4.7
 sphinx-toolbox==4.0.0
 sphinxcontrib-applehelp==2.0.0