Bump markdown-it-py from 2.1.0 to 2.2.0

Bumps [markdown-it-py](https://github.com/executablebooks/markdown-it-py) from 2.1.0 to 2.2.0.
- [Release notes](https://github.com/executablebooks/markdown-it-py/releases)
- [Changelog](https://github.com/executablebooks/markdown-it-py/blob/master/CHANGELOG.md)
- [Commits](executablebooks/markdown-it-py@v2.1.0...v2.2.0)

---
updated-dependencies:
- dependency-name: markdown-it-py
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -47,7 +47,7 @@ jupyterlab-widgets==1.1.1
 jupytext==1.14.0
 livereload==2.6.3
 lxml==4.9.1
-markdown-it-py==2.1.0
+markdown-it-py==2.2.0
 MarkupSafe==2.1.1
 matplotlib-inline==0.1.3
 mdit-py-plugins==0.3.0