fix: Update nbformat to v4.4 for all tested notebooks

[matthewfeickert]

Description

Resolves #722

Thanks to @MSeal's very helpful advice (:bowing_man:) we learned that scrapbook requires a notebook with nbformat of v4.2 or higher. However, multiBinPois.ipynb had nbformat of v4.1. By opening the notebook in Jupyter Lab the format is automatically updated to have nbformat of v4.4, resolving the Issue.

To make sure this isn't a problem again, all the notebooks that are tested are opened in Jupyter Lab and then saved to make sure that they have nbformat of v4.4.

Checklist Before Requesting Reviewer

• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

Before Merging

For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

* Update all tested notebooks to have nbformat v4.4 to avoid errors

[codecov]

Codecov Report

Merging #723 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #723   +/-   ##
=======================================
  Coverage   94.86%   94.86%           
=======================================
  Files          52       52           
  Lines        2763     2763           
  Branches      392      392           
=======================================
  Hits         2621     2621           
  Misses         97       97           
  Partials       45       45

Flag	Coverage Δ
#unittests	94.86% <ø> (ø)	⬆️

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[kratsg]

lgtm