Bump markdown from 3.3.4 to 3.3.6 (#511)

Bumps [markdown](https://github.com/Python-Markdown/markdown) from 3.3.4 to 3.3.6.
- [Release notes](https://github.com/Python-Markdown/markdown/releases)
- [Commits](https://github.com/Python-Markdown/markdown/compare/3.3.4...3.3.6

)

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

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requirements.notebook.txt

 ipython==7.16.1
 jupyter-client==7.1.0
-Markdown==3.3.4
+Markdown==3.3.6
 matplotlib==3.5.1
 pandas==1.3.5
 papermill==2.3.3