Updating Facebook iOS adapter for release version 5.7.0.0
Updating Facebook iOS adapter for release version 5.7.0.0

PiperOrigin-RevId: 296319699

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