Bump markdown from 3.4.4 to 3.5

Bumps [markdown](https://github.com/Python-Markdown/markdown) from 3.4.4 to 3.5.
- [Changelog](https://github.com/Python-Markdown/markdown/blob/master/docs/changelog.md)
- [Commits](Python-Markdown/markdown@3.4.4...3.5)

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

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

requirements.txt

@@ -1,4 +1,4 @@
-markdown==3.4.4
+markdown==3.5
 feedgenerator==2.1.0
 jinja2==3.1.2
 pygments==2.16.1