fix: Replace player key setter method lookup with Reflection

src/main/java/io/github/_4drian3d/unsignedvelocity/listener/event/ConnectListener.java

@@ -5,26 +5,14 @@
 import com.velocitypowered.api.event.Subscribe;
 import com.velocitypowered.api.event.connection.PostLoginEvent;
 import com.velocitypowered.api.proxy.Player;
-import com.velocitypowered.api.proxy.crypto.IdentifiedKey;
 import com.velocitypowered.proxy.connection.client.ConnectedPlayer;
 import io.github._4drian3d.unsignedvelocity.UnSignedVelocity;
 import io.github._4drian3d.unsignedvelocity.configuration.Configuration;
 import io.github._4drian3d.unsignedvelocity.listener.EventListener;
 
-import java.lang.invoke.MethodHandle;
-import java.lang.invoke.MethodHandles;
+import java.lang.reflect.Field;
 
 public class ConnectListener implements EventListener {
-    private static final MethodHandle KEY_SETTER;
-
-    static {
-        try {
-            final var lookup = MethodHandles.privateLookupIn(ConnectedPlayer.class, MethodHandles.lookup());
-            KEY_SETTER = lookup.findSetter(ConnectedPlayer.class, "playerKey", IdentifiedKey.class);
-        } catch (Exception e) {
-            throw new RuntimeException(e);
-        }
-    }
     @Inject
     private EventManager eventManager;
     @Inject
@@ -39,7 +27,12 @@ void onJoin(PostLoginEvent event) throws Throwable {
         }
         final Player player = event.getPlayer();
         if (player.getIdentifiedKey() != null) {
-            KEY_SETTER.invoke(player, null);
+            ConnectedPlayer connectedPlayer = (ConnectedPlayer) player;
+            Class<?> connectedPlayerClass = connectedPlayer.getClass();
+            Field playerKeyField = connectedPlayerClass.getDeclaredField("playerKey");
+            playerKeyField.setAccessible(true);
+            playerKeyField.set(connectedPlayer, null);
+            playerKeyField.setAccessible(false);
         }
     }