increase test iterations

Author: Anirav Kareddy

src/test/java/software/amazon/encryption/s3/S3EncryptionClientStreamTest.java

@@ -320,7 +320,7 @@ public void failsWhenBothBufferSizeAndDelayedAuthModeEnabled() {
 
     @Test
     public void customSetBufferSizeWithLargeObject() throws IOException {
-        for(int i=0; i < 5; i++) {
+        for(int i=0; i < 10; i++) {
             final String objectKey = appendTestSuffix("large-object-test-custom-buffer-size");
 
             Security.addProvider(new BouncyCastleProvider());