Fix flaky S3 multipart PUT test

Author: davidh44

services/s3/src/test/java/software/amazon/awssdk/services/s3/internal/multipart/S3MultipartClientPutObjectWiremockTest.java

@@ -204,6 +204,9 @@ public void subscribe(Subscriber<? super ByteBuffer> s) {
             .hasMessageContaining("Multiple subscribers detected.");
 
         verify(moreThan(0), putRequestedFor(anyUrl()).withQueryParam("partNumber", matching(String.valueOf(1))));
+        verify(lessThanOrExactly(2), putRequestedFor(anyUrl()).withQueryParam("partNumber", matching(String.valueOf(1))));
+
+        verify(moreThan(0), putRequestedFor(anyUrl()).withQueryParam("partNumber", matching(String.valueOf(2))));
         verify(lessThanOrExactly(2), putRequestedFor(anyUrl()).withQueryParam("partNumber", matching(String.valueOf(2))));
     }