Shuffle team members on game join

Should fix e.g. suspicious spleef where the party player order is directly put into the new game and thus the same player gets the pickaxe every time.
 
See here: https://github.com/NucleoidMC/spleef/blob/1.19.4/src/main/java/xyz/nucleoid/spleef/game/ToolConfig.java#L35

src/main/java/xyz/nucleoid/parties/PartyManager.java

@@ -13,6 +13,7 @@
 import java.util.Collection;
 import java.util.Collections;
 import java.util.UUID;
+import java.util.List;
 
 public final class PartyManager {
     private static PartyManager instance;
@@ -34,6 +35,8 @@ public static void register() {
             var partyManager = PartyManager.get(player.server);
 
             var members = partyManager.getPartyMembers(player);
+            Collections.shuffle((List<ServerPlayerEntity>) members);
+
             additional.addAll(members);
         });
     }