Bump sphinx-autodoc-typehints from 1.11.0 to 1.11.1 in /docs (#682)

Bumps [sphinx-autodoc-typehints](https://github.com/agronholm/sphinx-autodoc-typehints) from 1.11.0 to 1.11.1.
- [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@1.11.0...1.11.1)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

docs/requirements.txt

@@ -2,7 +2,7 @@
 # to generate documentation.
 
 sphinx==3.1.1
-sphinx_autodoc_typehints==1.11.0
+sphinx_autodoc_typehints==1.11.1
 sphinxcontrib-mermaid==0.5.0
 sphinx-typlog-theme==0.8.0
 sphinx-hoverxref==0.5b1