deprecated version of Android embedding -- migrate to V2 embedding

Hey guys, I'm pretty new to flutter (mainly experienced in iOS Swift, Ruby, and JavaScript -- but dabbled in some Flutter examples). Want to build a cross-platform app in Flutter without reinventing the wheel/starting from scratch. This starter app is a really awesome idea and you guys have some amazing docs and presentation -- thanks for doing this!

I just cloned this today and am getting an error that the Android embedding version has been deprecated. If it's only for Firebase, I don't plan to use that anyway, as I plan to build my own REST API backend. However, I have absolutely no idea about this architecture! It would be awesome if this template could possibly be fixed/updated to use the new embedding API. Or, could it be something on my end? I'm running an M1 MacBook Pro with the following Flutter:
```
flutter doctor 04/9 12:13:37
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel beta, 2.12.0-4.1.pre, on macOS 12.3.1 21E258
darwin-arm, locale en-US)
[✓] Android toolchain - develop for Android devices (Android SDK version
32.1.0-rc1)
[✓] Xcode - develop for iOS and macOS (Xcode 13.3)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2021.1)
[✓] IntelliJ IDEA Community Edition (version 2021.3.2)
[✓] VS Code (version 1.66.1)
[✓] Connected device (2 available)
[✓] HTTP Host Availability

• No issues found!
```

This is my run output:

```
bash run_script.sh 04/9 12:12:40
+++++API SDK pub clean+++++
+++++API SDK pub get+++++
Running "flutter pub get" in api_sdk... 13.8s
+++++API SDK done+++++
+++++Shared pub clean+++++
+++++Shared pub get+++++
Running "flutter pub get" in shared... 2,866ms
+++++Shared done+++++
+++++Main app pub clean+++++
Cleaning Xcode workspace... 1,492ms
+++++Main app pub get+++++
Running "flutter pub get" in app... 5.9s
This app is using a deprecated version of the Android embedding.
To avoid unexpected runtime failures, or future build failures, try to
migrate this app to the V2 embedding.
Take a look at the docs for migrating an app:
https://github.com/flutter/flutter/wiki/Upgrading-pre-1.12-Android-projects
The plugin `cloud_firestore` requires your app to be migrated to the
Android embedding v2. Follow the steps on
https://flutter.dev/go/android-project-migration and re-run this command.
+++++Main app run+++++
This app is using a deprecated version of the Android embedding.
To avoid unexpected runtime failures, or future build failures, try to
migrate this app to the V2 embedding.
Take a look at the docs for migrating an app:
https://github.com/flutter/flutter/wiki/Upgrading-pre-1.12-Android-projects
The plugin `cloud_firestore` requires your app to be migrated to the
Android embedding v2. Follow the steps on
https://flutter.dev/go/android-project-migration and re-run this command.
```