chore: [docs] bump the mkdocs group in /docs with 2 updates

Updates the requirements on [mkdocs-material](https://github.com/squidfunk/mkdocs-material) and [mkdocs-material-extensions](https://github.com/facelessuser/mkdocs-material-extensions) to permit the latest version.

Updates `mkdocs-material` to 9.4.7
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.4.6...9.4.7)

Updates `mkdocs-material-extensions` to 1.3
- [Release notes](https://github.com/facelessuser/mkdocs-material-extensions/releases)
- [Changelog](https://github.com/facelessuser/mkdocs-material-extensions/blob/master/changelog.md)
- [Commits](facelessuser/mkdocs-material-extensions@1.2...1.3)

---
updated-dependencies:
- dependency-name: mkdocs-material
  dependency-type: direct:production
  dependency-group: mkdocs
- dependency-name: mkdocs-material-extensions
  dependency-type: direct:production
  dependency-group: mkdocs
...

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

docs/requirements.txt

@@ -1,4 +1,4 @@
 mkdocs ~= 1.5.3
-mkdocs-material ~= 9.4.6
-mkdocs-material-extensions ~= 1.2
+mkdocs-material ~= 9.4.7
+mkdocs-material-extensions ~= 1.3
 mkdocs-redirects ~= 1.2.1