FirebaseUI does not use Credential Manager

[JoniGoos]

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Step 2: Describe your environment

• Android device: All
• Android OS version: All
• Google Play Services version: 18.5.0
• Firebase/Play Services SDK version: 33.7.0
• FirebaseUI version: 8.0.2

Step 3: Describe the problem:

I got a message in Google Play Console:
You're utilizing legacy Google Sign-in APIs, which are deprecated and planned to be removed in 2025. For details on migrating to Sign in with Google via Credential Manager, read our migration guide.

https://developer.android.com/identity/sign-in/legacy-gsi-migration

Steps to reproduce:

Observed Results:

FirebaseUI-Android is outdated

Expected Results:

FirebaseUI-Android is maintained.

Relevant Code: