dependabot: bump mkdocs-material from 9.6.7 to 9.6.9

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 9.6.7 to 9.6.9.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.6.7...9.6.9)

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

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

Author: dependabot[bot]

requirements.txt

@@ -1,7 +1,7 @@
 mkdocs==1.6.0
 # mkdocs-git-revision-date-localized-plugin==1.1.0
 mkdocs-glightbox==0.4.0
-mkdocs-material==9.6.7
+mkdocs-material==9.6.9
 mkdocs-material-extensions==1.3
 mkdocs-minify-plugin==0.8.0
 pygments==2.19.1