build(deps-dev): bump mkdocstrings-python from 1.11.1 to 1.12.1 (#842)

Bumps [mkdocstrings-python](https://github.com/mkdocstrings/python) from 1.11.1 to 1.12.1.
- [Release notes](https://github.com/mkdocstrings/python/releases)
- [Changelog](https://github.com/mkdocstrings/python/blob/main/CHANGELOG.md)
- [Commits](mkdocstrings/python@1.11.1...1.12.1)

---
updated-dependencies:
- dependency-name: mkdocstrings-python
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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