Bump markdown from 3.8 to 3.8.1

Bumps [markdown](https://github.com/Python-Markdown/markdown) from 3.8 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@3.8...3.8.1)

---
updated-dependencies:
- dependency-name: markdown
  dependency-version: 3.8.1
  dependency-type: indirect
...

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

Author: dependabot[bot]

requirements.txt

@@ -26,7 +26,7 @@ jinja2==3.1.6
     # via
     #   mkdocs
     #   mkdocs-material
-markdown==3.8
+markdown==3.8.1
     # via
     #   mkdocs
     #   mkdocs-material