Bump markdown from 3.6 to 3.7 (#692)

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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Mitch Dawson <86007219+mitchdawson1982@users.noreply.github.com>

pyproject.toml

@@ -12,7 +12,7 @@ django-prometheus = "^2.3.1"
 pyyaml = "^6.0.2"
 gunicorn = "^22.0.0"
 whitenoise = "^6.7.0"
-markdown = "^3.5.2"
+markdown = "^3.7"
 python-dotenv = "^1.0.1"
 markdown-headdown = "^0.1.3"
 nltk = "^3.8.1"