Fix order of outsandingDemand and request in onSubscribe

Author: alextwoods

utils/src/main/java/software/amazon/awssdk/utils/async/ByteBufferStoringSubscriber.java

@@ -181,8 +181,8 @@ private int transfer(ByteBuffer in, ByteBuffer out) {
     public void onSubscribe(Subscription s) {
         storingSubscriber.onSubscribe(new DemandIgnoringSubscription(s));
         subscription = s;
-        subscription.request(1);
         outstandingDemand.incrementAndGet();
+        subscription.request(1);
         subscriptionLatch.countDown();
     }