Bump markdown from 3.6 to 3.7 (#474)

Bumps [markdown](https://github.com/Python-Markdown/markdown) from 3.6 to 3.7.
- [Release notes](https://github.com/Python-Markdown/markdown/releases)
- [Changelog](https://github.com/Python-Markdown/markdown/blob/master/docs/changelog.md)
- [Commits](Python-Markdown/markdown@3.6...3.7)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pyproject.toml

@@ -50,7 +50,7 @@ dependencies = [
         'dj-static',
         'csscompressor',
         'django-markup',
-        'markdown==3.6',
+        'markdown==3.7',
         'bleach==5.0.*',
         'sentry-sdk==1.15.*',
         'babel',