fix possible concurrency issue on folia

Author: xGinko

AnarchyExploitFixesFolia/src/main/java/me/xginko/aef/modules/combat/PistonCrystalDelay.java

@@ -10,8 +10,8 @@
 import org.bukkit.event.Listener;
 import org.bukkit.event.block.BlockPistonExtendEvent;
 
-import java.util.HashMap;
 import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.TimeUnit;
 
 public class PistonCrystalDelay extends AEFModule implements Listener {
@@ -29,7 +29,7 @@ public PistonCrystalDelay() {
 
     @Override
     public void enable() {
-        extendCooldowns = new HashMap<>();
+        extendCooldowns = new ConcurrentHashMap<>();
         plugin.getServer().getPluginManager().registerEvents(this, plugin);
     }
 

AnarchyExploitFixesLegacy/src/main/java/me/xginko/aef/modules/combat/PistonCrystalDelay.java

@@ -10,8 +10,8 @@
 import org.bukkit.event.Listener;
 import org.bukkit.event.block.BlockPistonExtendEvent;
 
+import java.util.HashMap;
 import java.util.Map;
-import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.TimeUnit;
 
 public class PistonCrystalDelay extends AEFModule implements Listener {
@@ -29,7 +29,7 @@ public PistonCrystalDelay() {
 
     @Override
     public void enable() {
-        extendCooldowns = new ConcurrentHashMap<>();
+        extendCooldowns = new HashMap<>();
         plugin.getServer().getPluginManager().registerEvents(this, plugin);
     }