message: Reduce log level of two spammy messages.
  These make up a large part of node logs, so they shouldn't be INFO.
diff: @@ -387,7 +387,7 @@ impl<I: NodeIdT, C: Context + 'static> Synchronizer<I, C> {
  .flatten()
  .find(|(vv, _)| vv.inner().id() == transitive_dependency)
  {
  - info!(
  + debug!(
  dependency = ?transitive_dependency, %sender,
  "adding sender as a source for proposal"
  );
  @@ -409,7 +409,7 @@ impl<I: NodeIdT, C: Context + 'static> Synchronizer<I, C> {
  continue;
  }
  // Otherwise request the missing dependency from the sender.
  - info!(dependency = ?transitive_dependency, %sender, "requesting dependency");
  + debug!(dependency = ?transitive_dependency, %sender, "requesting dependency");
  let ser_msg = HighwayMessage::RequestDependency(transitive_dependency).serialize();
  outcomes.push(ProtocolOutcome::CreatedTargetedMessage(ser_msg, sender));
  continue;
  