Cómo arreglar error "You are applying Flutter's app_plugin_loader Gradle plugin" | flutter upgrade

Cómo arreglar los errores sobre Gradle después de actualizar flutter a la ultima versión 3.19.3:

You are applying Flutter's app_plugin_loader Gradle plugin imperatively using the apply script method, which is deprecated and will be removed in a future release. Migrate to applying Gradle plugins with the declarative plugins block: https://flutter.dev/go/flutter-gradle...

You are applying Flutter's main Gradle plugin imperatively using the apply script method, which is deprecated and will be removed in a future release. Migrate to applying Gradle plugins with the declarative plugins block: https://flutter.dev/go/flutter-gradle...