Update mkdocs requirement from ~=1.4.2 to ~=1.6.1

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@1.4.2...1.6.1)

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

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

pyproject.toml

@@ -94,7 +94,7 @@ docs = [
     'sphinx-click~=4.4.0',
     'sphinx-markdown-builder~=0.5.5',
     'mike~=1.1.2',
-    'mkdocs~=1.4.2',
+    'mkdocs~=1.6.1',
     'mkdocs-material~=9.5.36',
     'mkdocs-material-extensions~=1.1.1',
 ]