Aşaığdaki değişiklieri yapıp deneyebilirsiniz.
environment:
sdk:
">=2.7.0 
.0.0" onesignal_flutter: #^3.2.3
git:
url: https://github.com/luis901101/OneSignal-Flutter-SDK.git
ref: migrate_android_embedding_v2
store_redirect:
git: https://github.com/Danesz/store_redirect.git