Lower Codecov threshold to 99% because of GitHub Merge Queue limitations

[codecov[bot]]

Codecov Report

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

Comparison is base (5487c99) 99.49% compared to head (f2942c2) 99.46%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dpa/merge-queue #484 +/- ## =================================================== - Coverage 99.49% 99.46% -0.03% =================================================== Files 12 11 -1 Lines 398 377 -21 =================================================== - Hits 396 375 -21 Misses 2 2 ```

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