feat: update to songbird 0.6, make joining calls work by spawning everything as required in songbird's documentation

src/track_vcs.rs

@@ -87,6 +87,7 @@ pub async fn initialize_vcs(discord_client: &twilight_http::Client) -> VCs {
     }
 }
 
+#[tracing::instrument(skip(vcs))]
 pub fn update_vcs(voice_state_update: &VoiceStateUpdate, vcs: &VCs) {
     let user_id = voice_state_update.user_id;
     match voice_state_update.guild_id {