Bump mkdocs from 1.3.0 to 1.3.1

Bumps [mkdocs](https://github.com/mkdocs/mkdocs) from 1.3.0 to 1.3.1.
- [Release notes](https://github.com/mkdocs/mkdocs/releases)
- [Commits](https://github.com/mkdocs/mkdocs/compare/1.3.0...1.3.1)

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

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

docs/requirements-docs.txt

@@ -1,5 +1,5 @@
 markdown==3.4.1
-mkdocs==1.3.0
+mkdocs==1.3.1
 mkdocs-material==8.3.9
 mdx_truly_sane_lists==1.3
 pymdown-extensions==9.5