Remove deprecated event warning for inventory result event (#8672)

patches/api/Add-PrepareResultEvent-PrepareGrindstoneEvent.patch

@@ -158,7 +158,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
   * Called when an item is put in a slot and the result is calculated.
 + * @deprecated use {@link com.destroystokyo.paper.event.inventory.PrepareResultEvent}
   */
-+@Deprecated // Paper
++@Deprecated @org.bukkit.Warning(false) // Paper
  public class PrepareInventoryResultEvent extends InventoryEvent {
  
      private static final HandlerList handlers = new HandlerList();