Bump sphinx-autodoc-typehints from 1.11.1 to 1.12.0 in /docs

Bumps [sphinx-autodoc-typehints](https://github.com/agronholm/sphinx-autodoc-typehints) from 1.11.1 to 1.12.0.
- [Release notes](https://github.com/agronholm/sphinx-autodoc-typehints/releases)
- [Changelog](https://github.com/agronholm/sphinx-autodoc-typehints/blob/master/CHANGELOG.rst)
- [Commits](agronholm/sphinx-autodoc-typehints@1.11.1...1.12.0)

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

Author: dependabot-preview[bot]

docs/requirements.txt

@@ -2,7 +2,7 @@
 # to generate documentation.
 
 sphinx==3.5.4
-sphinx_autodoc_typehints==1.11.1
+sphinx_autodoc_typehints==1.12.0
 sphinxcontrib-mermaid==0.6.3
 sphinx-typlog-theme==0.8.0
 sphinx-hoverxref==0.5b1