Bump sphinx-rtd-theme from 1.1.1 to 2.0.0

Bumps [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) from 1.1.1 to 2.0.0.
- [Changelog](https://github.com/readthedocs/sphinx_rtd_theme/blob/master/docs/changelog.rst)
- [Commits](readthedocs/sphinx_rtd_theme@1.1.1...2.0.0)

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

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

requirements-dev.txt

@@ -1,5 +1,5 @@
 setuptools==65.6.3
 sphinx==5.3.0
-sphinx_rtd_theme==1.1.1
+sphinx_rtd_theme==2.0.0
 coverage==7.4.4
 flake8==6.0.0