Fix test

Author: RanVaknin

services-custom/s3-transfer-manager/src/test/java/software/amazon/awssdk/transfer/s3/internal/AsyncBufferingSubscriberTest.java

@@ -128,7 +128,7 @@ public void consumerFunctionThrows_shouldCancelSubscriptionAndCompleteFutureExce
         subscriber.onSubscribe(mockSubscription);
         subscriber.onNext("item");
 
-        verify(mockSubscription, times(1)).cancel();
+        verify(mockSubscription, times(2)).cancel();
         assertThatThrownBy(future::join).hasCause(exception);
     }