Bump sphinx-rtd-theme from 2.0.0 to 3.0.1

Bumps [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) from 2.0.0 to 3.0.1.
- [Changelog](https://github.com/readthedocs/sphinx_rtd_theme/blob/master/docs/changelog.rst)
- [Commits](readthedocs/sphinx_rtd_theme@2.0.0...3.0.1)

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

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

extra_requirements/requirements-docs.txt

@@ -1,7 +1,7 @@
 # File for the requirements of the documentation
 nbsphinx==0.9.3
 recommonmark==0.7.1
-sphinx_rtd_theme==2.0.0
+sphinx_rtd_theme==3.0.1
 sphinx==5.3.0
 sphinxcontrib_applehelp==1.0.4
 sphinxcontrib_devhelp==1.0.2