Update mkdocstrings requirement from ~=0.16.1 to ~=0.16.2 (#253)

Updates the requirements on [mkdocstrings](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/master/CHANGELOG.md)
- [Commits](mkdocstrings/mkdocstrings@0.16.1...0.16.2)

---
updated-dependencies:
- dependency-name: mkdocstrings
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements_docs.txt

@@ -3,4 +3,4 @@ mike~=1.1
 mkdocs~=1.2
 mkdocs-awesome-pages-plugin~=2.5
 mkdocs-material~=7.3
-mkdocstrings~=0.16.1
+mkdocstrings~=0.16.2