Bump matplotlib from 3.4.3 to 3.5.1 (#513)

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.4.3 to 3.5.1.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](https://github.com/matplotlib/matplotlib/compare/v3.4.3...v3.5.1

)

---
updated-dependencies:
- dependency-name: matplotlib
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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requirements.notebook.txt

 ipython==7.16.1
 jupyter-client==7.1.0
 Markdown==3.3.4
-matplotlib==3.4.3
+matplotlib==3.5.1
 pandas==1.3.4
 papermill==2.3.3