Update sphinx-autodoc-typehints requirement from >=3.10.5 to >=3.12.0

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)
- [Commits](tox-dev/sphinx-autodoc-typehints@3.10.5...3.12.0)

---
updated-dependencies:
- dependency-name: sphinx-autodoc-typehints
  dependency-version: 3.12.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

doc/requirements.txt

@@ -1,3 +1,3 @@
 sphinx==9.1.0
-sphinx-autodoc-typehints>=3.10.5
+sphinx-autodoc-typehints>=3.12.0
 PyQt5>=5.15.11