build(deps): bump sphinx-rtd-theme from 3.1.0rc2 to 3.1.0 (#67)

Bumps [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) from 3.1.0rc2 to 3.1.0.
- [Changelog](https://github.com/readthedocs/sphinx_rtd_theme/blob/master/docs/changelog.rst)
- [Commits](readthedocs/sphinx_rtd_theme@3.1.0rc2...3.1.0)

---
updated-dependencies:
- dependency-name: sphinx-rtd-theme
  dependency-version: 3.1.0
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -1,3 +1,3 @@
 sphinx == 9.1.0
-sphinx-rtd-theme == 3.1.0rc2
+sphinx-rtd-theme == 3.1.0
 enum-tools