Increase publishing rate in test

Otherwise the expected response code may not be received
because there's no enough concurrency. This way an error
path is exercised on the broker side.

References #46, rabbitmq/rabbitmq-server#3753

Author: acogoluegnes

src/test/java/com/rabbitmq/stream/impl/SacClientTest.java

@@ -492,7 +492,7 @@ void superStreamRebalancingShouldWorkWhilePublishing(TestInfo info) throws Excep
                               .messageBuilder()
                               .addData("hello".getBytes(StandardCharsets.UTF_8))
                               .build()));
-                  TestUtils.waitMs(10);
+                  TestUtils.waitMs(1);
                 }
               })
           .start();