Bump markdown from 3.0.1 to 3.2.2 in /cvat/requirements (#1693)

Bumps [markdown](https://github.com/Python-Markdown/markdown) from 3.0.1 to 3.2.2.
- [Release notes](https://github.com/Python-Markdown/markdown/releases)
- [Commits](https://github.com/Python-Markdown/markdown/compare/3.0.1...3.2.2)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

cvat/requirements/base.txt

@@ -27,7 +27,7 @@ rules==2.0
 GitPython==3.0.8
 coreapi==2.3.3
 django-filter==2.0.0
-Markdown==3.0.1
+Markdown==3.2.2
 djangorestframework==3.9.3
 Pygments==2.3.1
 drf-yasg==1.17.0