use official async trait (#6765)

Signed-off-by: 21pages <pages21@163.com>

src/server/video_service.rs

@@ -741,10 +741,11 @@ fn try_broadcast_display_changed(
     ) {
         log::info!("Display {} changed", display);
         if let Some(msg_out) = make_display_changed_msg(display_idx, Some(display)) {
-            sp.send(msg_out.clone());
+            let msg_out = Arc::new(msg_out);
+            sp.send_shared(msg_out.clone());
             // switch display may occur before the first video frame, add snapshot to send to new subscribers
             sp.snapshot(move |sps| {
-                sps.send(msg_out.clone());
+                sps.send_shared(msg_out.clone());
                 Ok(())
             })?;
             bail!("SWITCH");