Bump mkdocs from 1.2 to 1.2.3 in /docs/mkdocs

Bumps [mkdocs](https://github.com/mkdocs/mkdocs) from 1.2 to 1.2.3.
- [Release notes](https://github.com/mkdocs/mkdocs/releases)
- [Commits](https://github.com/mkdocs/mkdocs/compare/1.2...1.2.3)

---
updated-dependencies:
- dependency-name: mkdocs
  dependency-type: direct:production
...

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

docs/mkdocs/requirements.txt

@@ -1,5 +1,5 @@
 # This requirements file is for python3
-mkdocs == 1.2
+mkdocs == 1.2.3
 mkdocs-material == 7.1.7
 mkdocs-material-extensions == 1.0.1
 pymdown-extensions == 8.2