add retries for flaky notebooks

[atravitz]

let's see if this resolves our CI failures

closes #1263

Checklist

• Added a news entry

Developers certificate of origin

• I certify that this contribution is covered by the MIT License here and the Developer Certificate of Origin at https://developercertificate.org/.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.74%. Comparing base (907cdfd) to head (92f1247).
⚠️ Report is 275 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1278      +/-   ##
==========================================
+ Coverage   92.73%   92.74%   +0.01%     
==========================================
  Files         141      141              
  Lines       10855    10858       +3     
==========================================
+ Hits        10066    10070       +4     
+ Misses        789      788       -1     

Flag	Coverage Δ
fast-tests	92.74% <100.00%> (+0.01%)	⬆️

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[github-actions]

No API break detected ✅