Bump mkdocs from 1.5.2 to 1.5.3

Bumps [mkdocs](https://github.com/mkdocs/mkdocs) from 1.5.2 to 1.5.3.
- [Release notes](https://github.com/mkdocs/mkdocs/releases)
- [Commits](https://github.com/mkdocs/mkdocs/compare/1.5.2...1.5.3)

---
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==3.4.4
-mkdocs==1.5.2
+mkdocs==1.5.3
 mkdocs-material==9.3.1
 mdx_truly_sane_lists==1.3
 pymdown-extensions==10.3