Bump mkdocs-material from 9.5.19 to 9.5.21

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 9.5.19 to 9.5.21.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.5.19...9.5.21)

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

Signed-off-by: dependabot[bot] <support@github.com>

pyproject.toml

@@ -6,7 +6,7 @@ description = "Defaut package, used for development or readthedocs"
 [project.optional-dependencies]
 docs = [
   "mkdocs==1.6.0",
-  "mkdocs-material==9.5.19",
+  "mkdocs-material==9.5.21",
   "mdx_truly_sane_lists==1.3",
 ]