Bump mkdocs from 1.4.3 to 1.5.2 (#713)

Bumps [mkdocs](https://github.com/mkdocs/mkdocs) from 1.4.3 to 1.5.2.
- [Release notes](https://github.com/mkdocs/mkdocs/releases)
- [Commits](mkdocs/mkdocs@1.4.3...1.5.2)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements_docs.txt

@@ -1 +1 @@
-mkdocs==1.4.3
+mkdocs==1.5.2