Bump sphinx-autoapi from 3.1.0 to 3.1.1

Bumps [sphinx-autoapi](https://github.com/readthedocs/sphinx-autoapi) from 3.1.0 to 3.1.1.
- [Release notes](https://github.com/readthedocs/sphinx-autoapi/releases)
- [Changelog](https://github.com/readthedocs/sphinx-autoapi/blob/main/CHANGELOG.rst)
- [Commits](readthedocs/sphinx-autoapi@v3.1.0...v3.1.1)

---
updated-dependencies:
- dependency-name: sphinx-autoapi
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements-optional.txt

@@ -6,7 +6,7 @@ pre-commit==3.7.1
 
 # For generating documentation.
 sphinx==7.3.7
-sphinx-autoapi==3.1.0
+sphinx-autoapi==3.1.1
 
 # For 'manage' interactive shell
 manage==0.1.15