build(deps): bump sphinx-autodoc-typehints from 2.1.0 to 2.1.1 in /docs

Bumps [sphinx-autodoc-typehints](https://github.com/tox-dev/sphinx-autodoc-typehints) from 2.1.0 to 2.1.1.
- [Release notes](https://github.com/tox-dev/sphinx-autodoc-typehints/releases)
- [Changelog](https://github.com/tox-dev/sphinx-autodoc-typehints/blob/main/CHANGELOG.md)
- [Commits](tox-dev/sphinx-autodoc-typehints@2.1.0...2.1.1)

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

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

docs/requirements.txt

@@ -1,3 +1,3 @@
 sphinx==7.2.6
 sphinx-rtd-theme==2.0.0
-sphinx-autodoc-typehints==2.1.0
+sphinx-autodoc-typehints==2.1.1