build(deps): bump sphinx-autodoc-typehints

Bumps the docs-dependencies group in /docs with 1 update: [sphinx-autodoc-typehints](https://github.com/tox-dev/sphinx-autodoc-typehints).


Updates `sphinx-autodoc-typehints` from 3.6.2 to 3.8.0
- [Release notes](https://github.com/tox-dev/sphinx-autodoc-typehints/releases)
- [Commits](tox-dev/sphinx-autodoc-typehints@3.6.2...3.8.0)

---
updated-dependencies:
- dependency-name: sphinx-autodoc-typehints
  dependency-version: 3.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: docs-dependencies
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -1,4 +1,4 @@
 Sphinx==9.1.0
-sphinx-autodoc-typehints==3.6.2
+sphinx-autodoc-typehints==3.8.0
 furo==2025.12.19
 myst-parser==5.0.0