flaky PublisherSwitchMapDelayErrorTckTest.required_spec313_cancelMustMakeThePublisherEventuallyDropAllReferencesToTheSubscriber

[bryce-anderson]

https://github.com/apple/servicetalk/actions/runs/14410532770/job/40417131618#step:8:513

Gradle suite > Gradle test > io.servicetalk.concurrent.reactivestreams.tck.PublisherSwitchMapDelayErrorTckTest > required_spec313_cancelMustMakeThePublisherEventuallyDropAllReferencesToTheSubscriber FAILED
    java.lang.AssertionError: Publisher io.servicetalk.concurrent.reactivestreams.ReactiveStreamsAdapters$StToRsPublisher@2b40ff9c did not drop reference to test subscriber after subscription cancellation
        at org.testng.Assert.fail(Assert.java:110)
        at org.reactivestreams.tck.TestEnvironment.flop(TestEnvironment.java:222)
        at org.reactivestreams.tck.PublisherVerification$27.run(PublisherVerification.java:1018)
        at org.reactivestreams.tck.PublisherVerification.activePublisherTest(PublisherVerification.java:1135)
        at org.reactivestreams.tck.PublisherVerification.required_spec313_cancelMustMakeThePublisherEventuallyDropAllReferencesToTheSubscriber(PublisherVerification.java:1007)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)