Update mkdocs requirement from ~=1.6.0 to ~=1.6.1 (#205)

Updates the requirements on [mkdocs](https://github.com/mkdocs/mkdocs) to permit the latest version.
- [Release notes](https://github.com/mkdocs/mkdocs/releases)
- [Commits](mkdocs/mkdocs@1.6.0...1.6.1)

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

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doc_requirements.txt

@@ -1,5 +1,5 @@
 mkdocs-material[imaging]~=9.5.34
-mkdocs~=1.6.0
+mkdocs~=1.6.1
 mkdocstrings-python~=1.10.9
 black~=24.8.0
 griffe-inherited-docstrings~=1.0.0