Fix flaky tests

Author: zoewangg

test/codegen-generated-classes-test/src/test/java/software/amazon/awssdk/services/BlockingAsyncRequestResponseBodyResourceManagementTest.java

@@ -138,7 +138,7 @@ void verifyConnection(Consumer<ResponseInputStream<StreamingOutputOperationRespo
 
     private static class Server extends ChannelInitializer<Channel> {
         private static final byte[] CONTENT = ("{  "
-                                               + "\"foo\": " + RandomStringUtils.randomAscii(1024)
+                                               + "\"foo\": " + RandomStringUtils.randomAscii(1024 * 1024 * 10)
                                                + "}").getBytes(StandardCharsets.UTF_8);
         private ServerBootstrap bootstrap;
         private ServerSocketChannel serverSock;