Bump mkdocs-material from 9.4.2 to 9.4.3 in /docs

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 9.4.2 to 9.4.3.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.4.2...9.4.3)

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

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

docs/requirements.txt

@@ -13,7 +13,7 @@ mike==1.1.2
 mkdocs==1.5.3
 mkdocs-exclude==1.0.2
 mkdocs-macros-plugin==1.0.4
-mkdocs-material==9.4.2
+mkdocs-material==9.4.3
 mkdocs-material-extensions==1.2
 packaging==23.1
 Pygments==2.16.1