Bump markdown from 3.4.1 to 3.4.3

Bumps [markdown](https://github.com/Python-Markdown/markdown) from 3.4.1 to 3.4.3.
- [Release notes](https://github.com/Python-Markdown/markdown/releases)
- [Changelog](https://github.com/Python-Markdown/markdown/blob/master/docs/change_log/release-2.6.md)
- [Commits](Python-Markdown/markdown@3.4.1...3.4.3)

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

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

requirements/base.txt

@@ -6,7 +6,7 @@ psycopg2-binary==2.9.6
 requests==2.28.2
 django-filter==22.1
 django-model-utils==4.3.1
-Markdown==3.4.1
+Markdown==3.4.3
 django-localflavor==3.1
 django-extensions==3.2.1
 djangorestframework==3.14.0