`fs2.interop.flow.PublisherToSubscriberSpec.should cancel upstream if downstream completes` flake

3b56691a0830580ea113ef391c2fc169a6f17b97

ubuntu-latest, 3, temurin@17, rootJVM

Unfortunately, ScalaCheck minimized the buffer size argument to zero, which is invalid, so I think we lost the original error ...

==> X fs2.interop.flow.PublisherToSubscriberSpec.should cancel upstream if downstream completes  0.565s munit.FailException: Failing seed: 82KDw0NDjWAXJUVVYTrYStmnTfKrZEE9oA8wbVXJAuG=
You can reproduce this failure by adding the following override to your suite:

  override def scalaCheckInitialSeed = "82KDw0NDjWAXJUVVYTrYStmnTfKrZEE9oA8wbVXJAuG="

Exception raised on property evaluation.
> ARG_0: List(2147483647)
> ARG_1: List(923319774, 2147483647, -140306582, 2147483647, -2147483648, 1239258450, -154613030)
> ARG_2: 0
> ARG_2_ORIGINAL: 41
> Exception: java.lang.IllegalArgumentException: requirement failed: The buffer size MUST be positive
    at munit.Assertions.fail(Assertions.scala:256)
    at munit.Assertions.fail$(Assertions.scala:16)
    at munit.FunSuite.fail(FunSuite.scala:11)
    at munit.ScalaCheckEffectSuite.munit$ScalaCheckEffectSuite$$parseTestResult(ScalaCheckEffectSuite.scala:80)
    at munit.ScalaCheckEffectSuite.checkPropF$$anonfun$2(ScalaCheckEffectSuite.scala:68)
    at apply @ munit.CatsEffectAssertions.assertIO$$anonfun$1(CatsEffectAssertions.scala:52)
    at flatMap @ fs2.Compiler$Target.flatMap(Compiler.scala:163)
    at flatMap @ fs2.Compiler$Target.flatMap(Compiler.scala:163)
    at flatMap @ fs2.Compiler$Target.flatMap(Compiler.scala:163)
    at flatMap @ fs2.Compiler$Target.flatMap(Compiler.scala:163)
    at flatMap @ fs2.Compiler$Target.flatMap(Compiler.scala:163)
    at flatMap @ fs2.Compiler$Target.flatMap(Compiler.scala:163)
    at modify @ fs2.internal.Scope.open$$anonfun$1(Scope.scala:149)
    at flatMap @ fs2.Compiler$Target.flatMap(Compiler.scala:163)
    at uncancelable @ fs2.Compiler$Target.uncancelable(Compiler.scala:165)
    at rethrow$extension @ fs2.Compiler$Target.compile$$anonfun$1(Compiler.scala:157)
    at get @ fs2.internal.Scope.openScope(Scope.scala:278)
    at flatMap @ fs2.Compiler$Target.flatMap(Compiler.scala:163)
    at flatMap @ fs2.Compiler$Target.flatMap(Compiler.scala:163)
    at flatMap @ fs2.Pull$.fs2$Pull$$$_$interruptGuard$1(Pull.scala:951)

https://github.com/typelevel/fs2/actions/runs/13606087216/job/38037727735#step:11:3612

cc @BalmungSan

Start by reproducing the named fs2.interop.flow.PublisherToSubscriberSpec failure with ScalaCheck seed 82KDw0NDjWAXJUVVYTrYStmnTfKrZEE9oA8wbVXJAuG=. Inspect the property inputs around the buffer size, especially the minimized zero versus original 41. Done means the test no longer flakes while retaining the upstream-cancellation check and rejecting invalid buffer sizes.