 Updating MoPub iOS Adapterv5.18.2.1 changelog's zip URL
 Updating MoPub iOS Adapterv5.18.2.1 changelog's zip URL

PiperOrigin-RevId: 426426018

googleads/googleads-mobile-ios-mediation,googleads/googleads-mobile-ios-mediation,googleads/googleads-mobile-ios-mediation,googleads/googleads-mobile-ios-mediation