be more aggressive

Signed-off-by: James Bornholt <bornholt@amazon.com>

mountpoint-s3-client/tests/put_object.rs

@@ -171,7 +171,7 @@ async fn test_put_object_abort(size: usize) {
 
     // Try to wait a while for the async abort to complete. For the larger object, this might be
     // quite slow, especially in CI.
-    for _ in 0..20 {
+    for _ in 0..3 {
         tokio::time::sleep(tokio::time::Duration::from_secs(3)).await;
 
         let uploads_in_progress = get_mpu_count_for_key(&sdk_client, &bucket, &prefix, &key)