Bump plantuml-markdown from 3.9.2 to 3.9.3

Bumps [plantuml-markdown](https://github.com/mikitex70/plantuml-markdown) from 3.9.2 to 3.9.3.
- [Release notes](https://github.com/mikitex70/plantuml-markdown/releases)
- [Changelog](https://github.com/mikitex70/plantuml-markdown/blob/master/CHANGELOG.md)
- [Commits](mikitex70/plantuml-markdown@3.9.2...3.9.3)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -3,5 +3,5 @@
 
 mkdocs == 1.5.3
 mkdocs-material == 9.5.6
-plantuml-markdown == 3.9.2
+plantuml-markdown == 3.9.3
 mike == 2.0.0