Bump sphinx-rtd-theme from 3.0.2 to 3.1.0

Bumps [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) from 3.0.2 to 3.1.0.
- [Changelog](https://github.com/readthedocs/sphinx_rtd_theme/blob/master/docs/changelog.rst)
- [Commits](readthedocs/sphinx_rtd_theme@3.0.2...3.1.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

poetry.lock

@@ -16,7 +16,7 @@ sphinx-git = "^11"
 sphinxext-rediraffe = "^0.3.0"
 sphinx-last-updated-by-git = "^0.3.8"
 sphinx-autobuild = "^2025.8.25"
-sphinx-rtd-theme = "^3.0.2"
+sphinx-rtd-theme = "^3.1.0"
 
 [build-system]
 requires = ["poetry-core>=2.0.0,<3.0.0"]