[Dependabot]: Update sphinx-autodoc-typehints requirement

Updates the requirements on [sphinx-autodoc-typehints](https://github.com/tox-dev/sphinx-autodoc-typehints) to permit the latest version.
- [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...2.2.0)

---
updated-dependencies:
- dependency-name: sphinx-autodoc-typehints
  dependency-type: direct:production
...

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

doc/requirements.txt

@@ -9,4 +9,4 @@ sphinx ~= 7.3
 sphinxcontrib-mermaid>=0.7.1
 autoapi>=2.0.1
 sphinx_fontawesome>=0.0.6
-sphinx_autodoc_typehints ~= 2.1
+sphinx_autodoc_typehints ~= 2.2