Build(deps): Bump mkdocs-material in the patch group

Bumps the patch group with 1 update: [mkdocs-material](https://github.com/squidfunk/mkdocs-material).


Updates `mkdocs-material` from 9.6.15 to 9.6.16
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.6.15...9.6.16)

---
updated-dependencies:
- dependency-name: mkdocs-material
  dependency-version: 9.6.16
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: patch
...

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

Author: dependabot[bot]

pyproject.toml

@@ -62,7 +62,7 @@ dev-mkdocs = [
   "mkdocs-gen-files == 0.5.0",
   "mkdocs-literate-nav == 0.6.2",
   "mkdocs-macros-plugin == 1.3.7",
-  "mkdocs-material == 9.6.15",
+  "mkdocs-material == 9.6.16",
   "mkdocstrings[python] == 0.29.1",
   "mkdocstrings-python == 1.16.12",
   "frequenz-repo-config[lib] == 0.13.5",