fix: spawn songbird processing the event to try to address deadlock issue

src/main.rs

@@ -478,7 +478,15 @@ async fn handle_events(command_router: Arc<CommandRouter>, state: State, mut sha
 
 #[tracing::instrument(skip(command_router, state))]
 async fn handle_event(command_router: Arc<CommandRouter>, state: State, event: Event) {
-    state.songbird.process(&event).await;
+    tokio::spawn({
+        let event = event.clone();
+        let songbird = state.songbird.clone();
+        async move {
+            songbird.process(&event).await;
+        }
+    })
+    .await
+    .unwrap();
 
     match event {
         Event::VoiceStateUpdate(voice_state_update) => {