message: de-tune log level to debug for is_already_held message
diff: @@ -287,7 +287,7 @@ where
  }
  } else {
  // We are not connected, so the reconnection is likely already in progress.
  - warn!(%dest, ?msg, "{}: dropped outgoing message, no connection", self.our_id);
  + debug!(%dest, ?msg, "{}: dropped outgoing message, no connection", self.our_id);
  }
  }
  