🌱 Bump markdown from 3.8.2 to 3.9 (#2194)

Bumps [markdown](https://github.com/Python-Markdown/markdown) from 3.8.2 to 3.9.
- [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@3.8.2...3.9.0)

---
updated-dependencies:
- dependency-name: markdown
  dependency-version: '3.9'
  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]

requirements.txt

@@ -9,7 +9,7 @@ ghp-import==2.1.0
 idna==3.10
 Jinja2==3.1.6
 lxml==6.0.1
-Markdown==3.8.2
+Markdown==3.9
 markdown2==2.5.4
 MarkupSafe==3.0.2
 mergedeep==1.3.4