Bump sphinx-autodoc-typehints from 1.18.0 to 1.18.1 (#388)

Bumps [sphinx-autodoc-typehints](https://github.com/tox-dev/sphinx-autodoc-typehints) from 1.18.0 to 1.18.1.
- [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@1.18.0...1.18.1)

---
updated-dependencies:
- dependency-name: sphinx-autodoc-typehints
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]