Update mkdocstrings[python] requirement

Updates the requirements on [mkdocstrings[python]](https://github.com/mkdocstrings/mkdocstrings) to permit the latest version.
- [Release notes](https://github.com/mkdocstrings/mkdocstrings/releases)
- [Changelog](https://github.com/mkdocstrings/mkdocstrings/blob/main/CHANGELOG.md)
- [Commits](mkdocstrings/mkdocstrings@0.19.0...0.28.2)

---
updated-dependencies:
- dependency-name: mkdocstrings[python]
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements-docs.txt

@@ -5,4 +5,4 @@ mkdocs-git-revision-date-localized-plugin
 mkdocs-markdownextradata-plugin >=0.1.7,<0.3.0
 mkdocs-material >=7.1.9,<10.0.0
 mkdocs-minify-plugin
-mkdocstrings[python] >=0.19.0, <0.27.0
+mkdocstrings[python] >=0.19.0, <0.29.0