Bump sphinx-rtd-theme from 1.2.2 to 1.3.0

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:production
  update-type: version-update:semver-minor
...

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

requirements-docs.txt

@@ -1,4 +1,4 @@
 rstcheck==6.1.2; python_version >= '3.7'
 fasteners
-sphinx_rtd_theme==1.2.2
+sphinx_rtd_theme==1.3.0
 sphinx==6.2.1