docs references deprecated Google Sign-In JavaScript platform library

### Operating System

macOS

### Browser Version

Safari 16.5.2

### Firebase SDK Version

10.1.0

### Firebase SDK Product:

Auth

### Describe your project's tooling

index.html with source tag.

### Describe the problem

docs references deprecated Google Sign-In JavaScript platform library

### Steps and code to reproduce issue

In this [example](https://firebase.google.com/docs/reference/js/auth.oauthprovider#example), it references this [deprecated library](https://developers.google.com/identity/sign-in/web/reference). The example should be updated to use [Google Identity Services](https://developers.google.com/identity/gsi/web/guides/overview) instead.

Start with the linked Firebase Auth auth.oauthprovider example and compare its referenced sign-in library with the linked Google Identity Services overview. Update the example's documentation references so they use the current service, then verify that the example no longer points to the deprecated Google Sign-In JavaScript platform library.

Written by the indexing model from the issue text.