message: Make heartbeat tests less flaky
diff: @@ -1414,7 +1414,7 @@ mod jetstream {
  tokio::task::spawn(async move {
  for i in 0..25 {
  - tokio::time::sleep(Duration::from_millis(200)).await;
  + tokio::time::sleep(Duration::from_millis(400)).await;
  context
  .publish(
  "events".to_string(),
  @@ -1429,13 +1429,12 @@ mod jetstream {
  .stream()
  .max_messages_per_batch(25)
  .expires(Duration::from_millis(500))
  - .heartbeat(Duration::from_millis(150))
  + .heartbeat(Duration::from_millis(250))
  .messages()
  .await
  .unwrap()
  .take(25);
  while let Some(result) = iter.next().await {
  - println!("MESSAGE: {:?}", result);
  result.unwrap().ack().await.unwrap();
  }
  }
  