Bump mkdocs from 1.4.2 to 1.4.3

Bumps [mkdocs](https://github.com/mkdocs/mkdocs) from 1.4.2 to 1.4.3.
- [Release notes](https://github.com/mkdocs/mkdocs/releases)
- [Commits](https://github.com/mkdocs/mkdocs/compare/1.4.2...1.4.3)

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

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

requirements.txt

@@ -1,4 +1,4 @@
-mkdocs==1.4.2
+mkdocs==1.4.3
 mkdocs-git-revision-date-localized-plugin==1.2.0
 mkdocs-material==9.1.8
 mkdocs-redirects==1.2.0