message: style(server): remove `FutureExt::boxed` to unify project style
diff: @@ -106,10 +106,11 @@ impl AddrIncoming {
  }
  self.timeout = None;
  - let mut accept_fut = self.listener.accept().boxed();
  + let accept = self.listener.accept();
  + futures_util::pin_mut!(accept);
  loop {
  - match accept_fut.poll_unpin(cx) {
  + match accept.poll_unpin(cx) {
  Poll::Ready(Ok((socket, addr))) => {
  if let Some(dur) = self.tcp_keepalive_timeout {
  if let Err(e) = socket.set_keepalive(Some(dur)) {
  