Bump markdown from 3.3.7 to 3.4.1

Bumps [markdown](https://github.com/Python-Markdown/markdown) from 3.3.7 to 3.4.1.
- [Release notes](https://github.com/Python-Markdown/markdown/releases)
- [Commits](Python-Markdown/markdown@3.3.7...3.4.1)

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

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

requirements.txt

@@ -206,7 +206,7 @@ lxml==4.9.1
     # via mapentity
 mapentity==8.3.0
     # via geotrek (setup.py)
-markdown==3.3.7
+markdown==3.4.1
     # via geotrek (setup.py)
 markupsafe==2.0.1
     # via jinja2