fix: Fix thread safety in ManagedKeyMappingRegistry

kuma-api/common/src/main/java/net/blay09/mods/kuma/ManagedKeyMappingRegistry.java

@@ -3,21 +3,24 @@
 import net.blay09.mods.kuma.api.ManagedKeyMapping;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
 
 public class ManagedKeyMappingRegistry {
     public static final Comparator<ManagedKeyMapping> COMPARATOR = Comparator.comparingInt((ManagedKeyMapping it) -> it.getBinding().modifiers().size())
             .reversed();
 
-    private static final List<ManagedKeyMapping> keyMappings = new ArrayList<>();
+    private static final List<ManagedKeyMapping> keyMappings = Collections.synchronizedList(new ArrayList<>());
 
     public static void register(ManagedKeyMapping keyMapping) {
         keyMappings.add(keyMapping);
         keyMappings.sort(COMPARATOR);
     }
 
     public static List<ManagedKeyMapping> getKeyMappings() {
-        return keyMappings.stream().sorted(COMPARATOR).toList();
+        synchronized (keyMappings) {
+            return keyMappings.stream().sorted(COMPARATOR).toList();
+        }
     }
 }