chore(deps): bump mkdocs-material from 9.1.8 to 9.1.12 in /docs/_build

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 9.1.8 to 9.1.12.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](https://github.com/squidfunk/mkdocs-material/compare/9.1.8...9.1.12)

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

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

docs/_build/requirements.txt

@@ -8,7 +8,7 @@ MarkupSafe==2.1.2
 mergedeep==1.3.4
 mkdocs==1.4.2
 mkdocs-exclude==1.0.2
-mkdocs-material==9.1.8
+mkdocs-material==9.1.12
 mkdocs-material-extensions==1.1.1
 packaging==23.1
 Pygments==2.15.1