Bump mkdocs-material from 9.6.11 to 9.6.12 in the actions group

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


Updates `mkdocs-material` from 9.6.11 to 9.6.12
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.6.11...9.6.12)

---
updated-dependencies:
- dependency-name: mkdocs-material
  dependency-version: 9.6.12
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -1,3 +1,3 @@
 mkdocs==1.6.1
 mkdocs-jupyter==0.25.1
-mkdocs-material==9.6.11
+mkdocs-material==9.6.12