ci: covermode must be atomic when race is enabled

[codecov[bot]]

Codecov Report

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

Project coverage is 71.54%. Comparing base (66ed78d) to head (fd8cc0d).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #484 +/- ## ======================================= Coverage 71.54% 71.54% ======================================= Files 45 45 Lines 3876 3876 ======================================= Hits 2773 2773 Misses 690 690 Partials 413 413 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.