message: Fix clippy lints in `outgoing`
diff: @@ -1692,7 +1692,7 @@ mod tests {
  assert!(manager
  .handle_dial_outcome(DialOutcome::Successful {
  - addr: addr,
  + addr,
  handle: 1,
  node_id: id,
  when: clock.now(),
  @@ -1807,7 +1807,7 @@ mod tests {
  assert!(dials(addr, &manager.learn_addr(addr, false, clock.now())));
  assert!(manager
  .handle_dial_outcome(DialOutcome::Successful {
  - addr: addr,
  + addr,
  handle: 1,
  node_id: id,
  when: clock.now(),
  