Bump markdown from 3.4.3 to 3.4.4

Bumps [markdown](https://github.com/Python-Markdown/markdown) from 3.4.3 to 3.4.4.
- [Changelog](https://github.com/Python-Markdown/markdown/blob/master/docs/change_log/release-2.6.md)
- [Commits](Python-Markdown/markdown@3.4.3...3.4.4)

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

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

requirements/base.txt

@@ -20,7 +20,7 @@ whitenoise[brotli]==6.5.0
 pygments==2.15.1
 wordcloud==1.9.2
 django-admin-csvexport==2.2
-markdown==3.4.3
+markdown==3.4.4
 PyYAML==6.0.1
 uritemplate==4.1.1
 setuptools>=65.5.1 # not directly required, pinned by Snyk to avoid a vulnerability