Bump markdown from 3.7 to 3.8.1

Bumps [markdown](https://github.com/Python-Markdown/markdown) from 3.7 to 3.8.1.
- [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@3.7...3.8.1)

---
updated-dependencies:
- dependency-name: markdown
  dependency-version: 3.8.1
  dependency-type: direct:development
...

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

Author: dependabot[bot]

requirements-dev.txt

@@ -39,7 +39,7 @@ idna==3.10
 importlib-metadata==8.6.1 ; python_full_version < '3.10'
 jinja2==3.1.6
 jsmin==3.0.1
-markdown==3.7
+markdown==3.8.1
 markdown-it-py==3.0.0
 markupsafe==3.0.2
 mdurl==0.1.2