Stop controlling android gradle deps

[filiph]

If we had a bunch of plugins that we manage ourselves, that’s one thing, but this is a sample whose only dependencies are through flutter_google_maps. The dependencies are literally just

    id "dev.flutter.flutter-plugin-loader" version "1.0.0"
    id "com.android.application" version "8.9.0" apply false
    id "org.jetbrains.kotlin.android" version "2.1.10" apply false

and typically, they don't change in Flutter apps. If they must change, it's something that the flutter CLI tool can help with.