RHOAIENG-32577: bump Jupyter Core to 5.8.1

[dibryant]

What changes were proposed in this pull request?

Fixes for https://issues.redhat.com/browse/RHOAIENG-32577
Bump jupyter-core from 5.7.2 to 5.8.1 based on CVE-2025-30167

How was this pull request tested?

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.50%. Comparing base (3d29f51) to head (b009a90).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #129      +/-   ##
==========================================
- Coverage   80.51%   80.50%   -0.02%     
==========================================
  Files         151      151              
  Lines       19499    19499              
  Branches      483      487       +4     
==========================================
- Hits        15699    15697       -2     
- Misses       3614     3616       +2     
  Partials      186      186              

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[jesuino]

Hello @dibryant

Thank you so much for your contribution!

Would it be possible to send a PR to upstream Elyra? Later we can cherry-pick this to this repo.

Thanks!

[jesuino]

Thanks again for your contribution, @dibryant ! I went ahead and sent an upstream contribution as well.