evalFilterNotAsync test flaky

[mpilquist]

==> X fs2.StreamCombinatorsSuite.evalFilterNotAsync - filters up to N items in parallel  2.02s java.util.NoSuchElementException: null
[1133](https://github.com/mpilquist/fs2/actions/runs/4124422453/jobs/7123653749#step:11:1134)
    at fs2.Stream$CompileOps.lastOrError$$anonfun$1$$anonfun$1(Stream.scala:4875)
[1134](https://github.com/mpilquist/fs2/actions/runs/4124422453/jobs/7123653749#step:11:1135)
    at scala.Option.fold(Option.scala:263)
[1135](https://github.com/mpilquist/fs2/actions/runs/4124422453/jobs/7123653749#step:11:1136)
    at fs2.Stream$CompileOps.lastOrError$$anonfun$1(Stream.scala:4875)
[1136](https://github.com/mpilquist/fs2/actions/runs/4124422453/jobs/7123653749#step:11:1137)
    at flatMap @ fs2.Compiler$Target.flatMap(Compiler.scala:163)
[1137](https://github.com/mpilquist/fs2/actions/runs/4124422453/jobs/7123653749#step:11:1138)
    at flatMap @ fs2.Compiler$Target.flatMap(Compiler.scala:163)
[1138](https://github.com/mpilquist/fs2/actions/runs/4124422453/jobs/7123653749#step:11:1139)
    at flatMap @ fs2.Compiler$Target.flatMap(Compiler.scala:163)
[1139](https://github.com/mpilquist/fs2/actions/runs/4124422453/jobs/7123653749#step:11:1140)
    at flatMap @ fs2.Compiler$Target.flatMap(Compiler.scala:163)
[1140](https://github.com/mpilquist/fs2/actions/runs/4124422453/jobs/7123653749#step:11:1141)
    at flatMap @ fs2.Compiler$Target.flatMap(Compiler.scala:163)
[1141](https://github.com/mpilquist/fs2/actions/runs/4124422453/jobs/7123653749#step:11:1142)
    at flatMap @ fs2.Compiler$Target.flatMap(Compiler.scala:163)
[1142](https://github.com/mpilquist/fs2/actions/runs/4124422453/jobs/7123653749#step:11:1143)
    at modify @ fs2.internal.Scope.close(Scope.scala:262)
[1143](https://github.com/mpilquist/fs2/actions/runs/4124422453/jobs/7123653749#step:11:1144)
    at flatMap @ fs2.Compiler$Target.flatMap(Compiler.scala:163)
[1144](https://github.com/mpilquist/fs2/actions/runs/4124422453/jobs/7123653749#step:11:1145)
    at rethrow$extension @ fs2.Compiler$Target.compile$$anonfun$1(Compiler.scala:157)
[1145](https://github.com/mpilquist/fs2/actions/runs/4124422453/jobs/7123653749#step:11:1146)
    at get @ fs2.internal.Scope.openScope(Scope.scala:281)
[1146](https://github.com/mpilquist/fs2/actions/runs/4124422453/jobs/7123653749#step:11:1147)
    at flatMap @ fs2.Compiler$Target.flatMap(Compiler.scala:163)
[1147](https://github.com/mpilquist/fs2/actions/runs/4124422453/jobs/7123653749#step:11:1148)
    at flatMap @ fs2.Pull$.goCloseScope$1$$anonfun$1$$anonfun$3(Pull.scala:1216)
[1148](https://github.com/mpilquist/fs2/actions/runs/4124422453/jobs/7123653749#step:11:1149)
    at update @ fs2.internal.Scope.releaseChildScope(Scope.scala:227)
[1149](https://github.com/mpilquist/fs2/actions/runs/4124422453/jobs/7123653749#step:11:1150)
    at flatMap @ fs2.Compiler$Target.flatMap(Compiler.scala:163)
[1150](https://github.com/mpilquist/fs2/actions/runs/4124422453/jobs/7123653749#step:11:1151)
    at flatMap @ fs2.Compiler$Target.flatMap(Compiler.scala:163)