fix server crash with creative tabs goh

Author: brachy84

src/main/java/com/cleanroommc/groovyscript/gameobjects/GameObjectHandlerManager.java

@@ -3,6 +3,7 @@
 import com.cleanroommc.groovyscript.api.IGameObjectParser;
 import com.cleanroommc.groovyscript.api.IIngredient;
 import com.cleanroommc.groovyscript.api.Result;
+import com.cleanroommc.groovyscript.core.mixin.CreativeTabsAccessor;
 import com.cleanroommc.groovyscript.core.mixin.OreDictionaryAccessor;
 import com.cleanroommc.groovyscript.helper.ingredient.OreDictIngredient;
 import com.cleanroommc.groovyscript.helper.ingredient.OreDictWildcardIngredient;
@@ -107,7 +108,7 @@ public static void init() {
                 .register();
         GameObjectHandler.builder("creativeTab", CreativeTabs.class)
                 .parser(GameObjectHandlers::parseCreativeTab)
-                .completerOfNamed(() -> Arrays.asList(CreativeTabs.CREATIVE_TAB_ARRAY), CreativeTabs::getTabLabel)
+                .completerOfNamed(() -> Arrays.asList(CreativeTabs.CREATIVE_TAB_ARRAY), v -> ((CreativeTabsAccessor) v).getTabLabel2())
                 .register();
         GameObjectHandler.builder("textformat", TextFormatting.class)
                 .parser(GameObjectHandlers::parseTextFormatting)