`GrpcClientTest.streamingRequestFailureWithUnexpectedHttpCode` is flaky

GrpcClientTest > streamingRequestFailureWithUnexpectedHttpCode FAILED
    org.junit.ComparisonFailure: 
    Expecting value to be true but was false expected:<[tru]e> but was:<[fals]e>
        at com.squareup.wire.GrpcClientTest$streamingRequestFailureWithUnexpectedHttpCode$2.invokeSuspend(GrpcClientTest.kt:1718)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
        at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:99)
        at kotlinx.coroutines.EventLoopImplBase.processNextEvent(EventLoop.common.kt:263)
        at kotlinx.coroutines.BlockingCoroutine.joinBlocking(Builders.kt:95)
        at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking(Builders.kt:69)
        at kotlinx.coroutines.BuildersKt.runBlocking(Unknown Source)
        at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking$default(Builders.kt:47)
        at kotlinx.coroutines.BuildersKt.runBlocking$default(Unknown Source)
        at com.squareup.wire.GrpcClientTest.streamingRequestFailureWithUnexpectedHttpCode(GrpcClientTest.kt:1709)

Start with GrpcClientTest.kt around lines 1709-1718 and run streamingRequestFailureWithUnexpectedHttpCode repeatedly to reproduce the flake. Trace the intermittent false assertion and make the test reliable, then confirm the test passes consistently.