Fix race condition in QueueSink causing async enumerable timeout#7973

Aaronontheweb merged 2 commits into

akkadotnet:devakkadotnet/akka.net:devfrom

Aaronontheweb:claude-wt-AsyncEnumerableSpec.RunAsAsyncEnumerable_Throws_on_Abrupt_Stream_terminationAaronontheweb/akka.net:claude-wt-AsyncEnumerableSpec.RunAsAsyncEnumerable_Throws_on_Abrupt_Stream_terminationCopy head branch name to clipboard