Migrate to Android v2 embedding

[PieterAelse]

See info here: https://flutter.dev/docs/development/packages-and-plugins/plugin-api-migration

[bhanuka96]

we cannot use this plugin after flutter 2.5.0

The plugins ext_storage use a deprecated version of the Android embedding. To avoid unexpected runtime failures, or future build failures, try to see if these plugins support the Android V2 embedding. Otherwise, consider removing them since a future release of Flutter will remove these deprecated APIs. If you are plugin author, take a look at the docs for migrating the plugin to the V2 embedding: https://flutter.dev/go/android-plugin-migration.

[swarupbc]

same here, please fix this issue

[antoniosap]

The plugin ext_storage uses a deprecated version of the Android embedding. To avoid unexpected runtime failures, or future build failures, try to see if this plugin supports the Android V2 embedding. Otherwise, consider removing it since a future release of Flutter will remove these deprecated APIs. If you are plugin author, take a look at the docs for migrating the plugin to the V2 embedding: https://flutter.dev/go/android-plugin-migration.