chore(deps): update dependency mkdocs to >=1.6.1 (#249)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

docs/requirements.txt

@@ -1,3 +1,3 @@
-mkdocs>=1.5.3
+mkdocs>=1.6.1
 mkdocs-include-markdown-plugin>=6.0.4
 mkdocstrings[python]>=0.24