Flaky `RaceNJvmTest.firstRacerOutOf2AlwaysWinsOnASingleThread()` tests

[serras]

This tests is starting to fail in almost every run in the Kotlin Compatibility Testing, using development version of 2.1. We should decide whether to completely mute this, or find a good solution.

java.lang.AssertionError: Expecting actual not to be null
  at arrow.fx.coroutines.RaceNJvmTest$firstRacerOutOf2AlwaysWinsOnASingleThread$1.invokeSuspend(RaceNJvmTest.kt:73)
  at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
  at kotlinx.coroutines.UndispatchedCoroutine.afterResume(CoroutineContext.kt:266)
  at kotlinx.coroutines.AbstractCoroutine.resumeWith(AbstractCoroutine.kt:99)
  at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:46)
  at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:104)
  at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:584)
  at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:811)
  at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:715)
  at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:702)