Bump sphinx-autodoc-typehints from 2.0.0 to 2.4.1 (#692)

* Bump sphinx-autodoc-typehints from 2.0.0 to 2.4.1

Bumps [sphinx-autodoc-typehints](https://github.com/tox-dev/sphinx-autodoc-typehints) from 2.0.0 to 2.4.1.
- [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@2.0.0...2.4.1)

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

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

* Update requirements/requirements_docs.txt

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: German <[email protected]>

Author: dependabot[bot]

requirements/requirements_docs.txt

@@ -12,5 +12,6 @@ sphinx-notfound-page==1.0.0
 sphinx-copybutton==0.5.0
 sphinx-gallery==0.16.0
 ansys_sphinx_theme==0.16.0
-sphinx-autodoc-typehints==2.0.0
+sphinx-autodoc-typehints==2.0.0; python_version == '3.8'
+sphinx-autodoc-typehints==2.4.1; python_version >= '3.9'
 pyvista==0.43.8