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

@@ -9,7 +9,7 @@ irc==20.3.0
 isodate==0.6.1
 Jinja2==3.1.2
 jsmin==3.0.1
-Markdown==3.4.4
+Markdown==3.5
 MarkupSafe==2.1.3
 marshmallow-dataclass==8.6.0
 marshmallow==3.20.1