feature: add 50080 Error code (#2272)

Co-authored-by: Discord.Net Robot <robot@elons.sweatshop.stop>

src/Discord.Net.Core/DiscordErrorCode.cs

@@ -152,6 +152,7 @@ namespace Discord
         InvalidMessageType = 50068,
         PaymentSourceRequiredForGift = 50070,
         CannotDeleteRequiredCommunityChannel = 50074,
+        CannotEditStickersWithinAMessage = 50080,
         InvalidSticker = 50081,
         CannotExecuteOnArchivedThread = 50083,
         InvalidThreadNotificationSettings = 50084,