🌱 Bump markdown from 3.5.2 to 3.6 (#701)

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

docs/requirements.txt

@@ -9,7 +9,7 @@ ghp-import==2.1.0
 idna==3.6
 Jinja2==3.1.3
 lxml==5.1.0
-Markdown==3.5.2
+Markdown==3.6
 markdown2==2.4.13
 MarkupSafe==2.1.5
 mergedeep==1.3.4