message: Ensure right record is updated in integration test
  Update comment in test and add sleep to integration test to ensure the update of the right record
diff: @@ -2261,6 +2261,9 @@ async fn test_stream_fetch_join(
  .await
  .expect("write");
  + // Sleep before sending records to left topic, so right record is updated
  + sleep(Duration::from_millis(100)).await;
  +
  // send back that consume has processed all current bacthes
  client_socket
  .send_and_receive(RequestMessage::new_request(UpdateOffsetsRequest {
  @@ -2274,9 +2277,8 @@ async fn test_stream_fetch_join(
  // Input: the following records:
  //
  - // 33
  - // 44
  -
  + // 55
  + // 66
  let mut records_left = BatchProducer::builder()
  .records(2u16)
  .record_generator(Arc::new(|i, _| Record::new(((i + 5) * 11).to_string())))
  