Bump sphinx-rtd-theme from 1.2.2 to 1.3.0 (#506)

Bumps [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) from 1.2.2 to 1.3.0.
- [Changelog](https://github.com/readthedocs/sphinx_rtd_theme/blob/master/docs/changelog.rst)
- [Commits](readthedocs/sphinx_rtd_theme@1.2.2...1.3.0)

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

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

Author: dependabot[bot]

poetry.lock

@@ -34,7 +34,7 @@ black = "^23.7.0"
 mypy = "^1.5"
 types-urllib3 = "^1.26.25"
 Sphinx = "^6.2.1"
-sphinx-rtd-theme = "^1.2.2"
+sphinx-rtd-theme = "^1.3.0"
 # keep this in sync with docs/requirements.txt for readthedocs.org
 sphinx-autodoc-typehints = "^1.23.0"
 types-certifi = "^2021.10.8"