Bump markdown from 2.6.11 to 3.6

Bumps [markdown](https://github.com/Python-Markdown/markdown) from 2.6.11 to 3.6.
- [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@2.6.11...3.6)

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

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

pyproject.toml

@@ -38,7 +38,7 @@ classifiers = [
     "Topic :: Text Processing :: Markup :: HTML",
 ]
 dependencies = [
-    "markdown==2.6.11",
+    "markdown==3.6",
     "Jinja2==3.1.3",
     "python-slugify==8.0.4",
 ]