Update sphinx-autodoc-typehints requirement from <1.19.3,>=1.12.0 to …

…>=1.12.0,<1.20.1 (#844)

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@1.12.0...1.20.0)

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

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

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

requirements/docs.txt

@@ -1,7 +1,7 @@
 # dependencies for building docs, separate from dev.txt as this is also used for builds on readthedocs.org
 # core dependencies
 sphinx>=4.2.0, <6.1.0
-sphinx-autodoc-typehints>=1.12.0, <1.19.3  # limited due to https://github.com/tox-dev/sphinx-autodoc-typehints/issues/259 and 260 
+sphinx-autodoc-typehints>=1.12.0, <1.20.1  # limited due to https://github.com/tox-dev/sphinx-autodoc-typehints/issues/259 and 260 
 sphinx-rtd-theme>=1.0.0, <2.0.0
 myst-parser>=0.14, <0.19
 sphinxcontrib-apidoc>=0.3.0, <0.4.0