Re: [PR PATCH] [Merged]: Jupyter notebook updates

[ahesford <ahesford@users.noreply.github.com>]

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There's a merged pull request on the void-packages repository

Jupyter notebook updates
https://github.com/void-linux/void-packages/pull/36569

Description:
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#### Testing the changes
- I tested the changes in this PR: **briefly**

Updates:
 - python3-jupyter_notebook: to 6.4.10.
 - python3-jupyter_nbconvert: to 6.4.5.
 - python3-jupyter_nbformat: to 5.3.0.

The new package python3-fastjsonschema is needed for nbformat.

This also restores the update of Jinja2 to 3.1.1 which was reverted because of incompatibility with nbconvert-6.0.7 (see 3d6eb58)

NOTES:
 - For fastjsonschema I used the tarball from github, instead of pypi, because the latter doesn't include the testsuite.
 - For nbconvert I had to add a PYTHONPATH setting to `do_check()` because the "old" nbconvert will be installed at check-time (circular dependency?) and without this the testsuite will be testing the old nbconvert (which fails!).

What should we do about maintainership? @dkwo I think you use jupyter much more than I do (I'm more of a CLI type) do you want to take over? Otherwise I can do it.

@ahesford 
@dkwo