Bump markdown from 3.5.2 to 3.6

Bumps [markdown](https://github.com/Python-Markdown/markdown) from 3.5.2 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@3.5.2...3.6)

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

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

requirements.txt

@@ -10,7 +10,7 @@ click_option_group==0.5.6
 jinja2==3.1.4
 pyyaml==6.0.1
 # We render Markdown glossary files as HTML in the Cloudsplaining report
-markdown==3.5.2
+markdown==3.6
 # AWS IAM Logic
 policy-sentry==0.13.0
 # Schema validation