fix: send velocity syncproxy tab only while in PLAY state (#1469)

SyncProxy velocity currently sends tab updates even when the players are
in CONFIGURATION state, causing them to disconnect

Updated velocity to 3.3.0-SNAPSHOT (from 3.1.1) to get access to new API
Added if to velocity SyncProxyManagement to only send tab updates to
players in PLAY state

Player doesn't get kicked after reentering configuration and syncproxy
sending a tab update

Fixes #1467

gradle/libs.versions.toml

@@ -57,7 +57,7 @@ logback = "1.5.6"
 
 # platform api versions
 sponge = "9.0.0"
-velocity = "3.1.1"
+velocity = "3.3.0-SNAPSHOT"
 waterdogpe = "1.2.4"
 nukkitX = "1.0-SNAPSHOT"
 minestom = "d5c6126a6b"

modules/syncproxy/src/main/java/eu/cloudnetservice/modules/syncproxy/platform/velocity/VelocitySyncProxyManagement.java

@@ -16,6 +16,7 @@
 
 package eu.cloudnetservice.modules.syncproxy.platform.velocity;
 
+import com.velocitypowered.api.network.ProtocolState;
 import com.velocitypowered.api.proxy.Player;
 import com.velocitypowered.api.proxy.ProxyServer;
 import eu.cloudnetservice.driver.event.EventManager;
@@ -87,6 +88,11 @@ public void registerService(@NonNull ServiceRegistry registry) {
 
   @Override
   public void playerTabList(@NonNull Player player, @Nullable String header, @Nullable String footer) {
+    if (player.getProtocolState() != ProtocolState.PLAY) {
+      // prevent tab list updates if player is in an invalid state. Issue #1467
+      return;
+    }
+
     if (header == null || footer == null) {
       player.getTabList().clearHeaderAndFooter();
     } else {