refactor(ml_custom, example): replace usage of deprecated & removed Image Picker API
refactor(ml_custom, example): replace usage of deprecated & removed Image Picker API

firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire