test(python): Raise import timing test threshold

[stinodego]

We should look into the reason behind the failures, e.g. some regression or something with the GitHub runners maybe. Until then I'm upping the threshold to avoid spurious failures.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.78%. Comparing base (10d223b) to head (36fe17b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16302      +/-   ##
==========================================
- Coverage   80.78%   80.78%   -0.01%     
==========================================
  Files        1393     1393              
  Lines      179362   179362              
  Branches     2921     2921              
==========================================
- Hits       144902   144893       -9     
- Misses      33957    33966       +9     
  Partials      503      503              

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