Ignite SDK 1.21.4

1.21.4 public release

• TicketmasterFoundation: 1.6.8 (build 574)
• TicketmasterAuthentication: 3.17.17 (build 141) (updated)
• TicketmasterDiscoveryAPI: 4.1.4 (build 24)
• TicketmasterPrePurchase: 4.1.4 (build 24)
• TicketmasterPurchase: 4.1.4 (build 24)
• TicketmasterSwiftProtobuf: 1.29.2
• TicketmasterSecureEntry: 1.13.0 (build 10170)
• TicketmasterTickets: 3.18.4 (build 10378) (updated)