Wrap _listeners access with _realtimeLockQueue in fetchLatestConfig completionHandler#13776

paulb777 merged 1 commit intofirebase:mainfirebase/firebase-ios-sdk:mainfrom

yanz-safe:rcnconfigrealtime_listeners_data_racing_fixyanz-safe/firebase-ios-sdk:rcnconfigrealtime_listeners_data_racing_fixCopy head branch name to clipboard