message: add: UnknownGiftCode error code
diff: @@ -27,6 +27,7 @@ export enum DiscordJsonErrorCodes {
  UnknownBranch,
  UnknownStoreDirectoryLayout,
  UnknownRedistributable = 10036,
  + UnknownGiftCode = 10038,
  UnknownGuildTemplate = 10057,
  UnknownDiscoveryCategory = 10059,
  UnknownInteraction = 10062,
  