chore(deps): bump markdown from 3.5 to 3.5.1

Bumps [markdown](https://github.com/Python-Markdown/markdown) from 3.5 to 3.5.1.
- [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@3.5...3.5.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

docs/requirements.txt

@@ -1,5 +1,5 @@
 mkdocs-glightbox==0.3.4
-markdown==3.5
+markdown==3.5.1
 mkdocs-awesome-pages-plugin==2.9.2
 mkdocs-git-revision-date-localized-plugin==1.2.1
 mkdocs-macros-plugin==1.0.4