removed unused definition

Author: AlmightyMikkel

Runtime/Game/Requests/CatalogRequests.cs

@@ -1,6 +1,5 @@
 using LootLocker.LootLockerEnums;
 using System.Collections.Generic;
-using Unity.Plastic.Antlr3.Runtime;
 #if UNITY_2020_2_OR_NEWER
 using JetBrains.Annotations;
 #endif