Build(deps): bump sphinx-autoapi from 2.1.0 to 2.1.1 in /docs/source

Bumps [sphinx-autoapi](https://github.com/readthedocs/sphinx-autoapi) from 2.1.0 to 2.1.1.
- [Changelog](https://github.com/readthedocs/sphinx-autoapi/blob/main/CHANGELOG.rst)
- [Commits](readthedocs/sphinx-autoapi@v2.1.0...v2.1.1)

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

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

docs/source/requirements.txt

@@ -1,2 +1,2 @@
 sphinx==7.0.1
-sphinx-autoapi==2.1.0
+sphinx-autoapi==2.1.1