feat(server): check for version in update requests

server/src/main.rs

@@ -181,6 +181,10 @@ async fn upload(
     state: State<Arc<AppState>>,
     data: MsgPack<Update>,
 ) -> Result<(), AppError> {
+    if data.version != 2 {
+        return Err(anyhow::anyhow!("invalid update request version").into());
+    }
+
     let mut t = state.pool.begin().await?;
 
     for player in &data.players {
@@ -253,6 +257,7 @@ async fn upload(
 
 #[derive(Deserialize)]
 struct Update {
+    version: u8,
     territory: u32,
     world: u32,
     players: Vec<PlayerInfo>,