build(deps): bump sphinx-rtd-theme from 1.3.0 to 2.0.0 in /docs (#3016)

Bumps [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) from 1.3.0 to 2.0.0.
- [Changelog](https://github.com/readthedocs/sphinx_rtd_theme/blob/master/docs/changelog.rst)
- [Commits](readthedocs/sphinx_rtd_theme@1.3.0...2.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

docs/requirements.txt

@@ -17,7 +17,7 @@ pytz==2023.3.post1
 requests==2.31.0
 snowballstemmer==2.2.0
 sphinx-favicon==1.0.1
-sphinx-rtd-theme==1.3.0
+sphinx-rtd-theme==2.0.0
 sphinxcontrib-applehelp==1.0.7
 sphinxcontrib-devhelp==1.0.5
 sphinxcontrib-htmlhelp==2.0.4