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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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