FirebaseModelDownloaderTest.java: fix flake due to race condition in getModel_updateBackground_localExists_UpdateFound#7242

dconeybe merged 1 commit intomainfirebase/firebase-android-sdk:mainfrom

dconeybe/ml-modeldownloader/FirebaseModelDownloaderTest_FlakeFix_getModel_updateBackground_localExists_UpdateFoundfirebase/firebase-android-sdk:dconeybe/ml-modeldownloader/FirebaseModelDownloaderTest_FlakeFix_getModel_updateBackground_localExists_UpdateFoundCopy head branch name to clipboard