Dependency updates, remove deprecated code

Author: jt274

packages/firebase_ui_auth/example/pubspec.yaml

@@ -22,8 +22,8 @@ environment:
 
 dependencies:
   cupertino_icons: ^1.0.6
-  firebase_auth: ^5.7.0
-  firebase_core: ^3.15.2
+  firebase_auth: ^6.0.0
+  firebase_core: ^4.0.0
   flutter:
     sdk: flutter
   flutter_localizations:

packages/firebase_ui_auth/lib/firebase_ui_auth.dart

@@ -7,12 +7,12 @@ import 'package:firebase_core/firebase_core.dart';
 import 'package:firebase_ui_oauth/firebase_ui_oauth.dart';
 import 'package:flutter/widgets.dart';
 
-export 'package:firebase_ui_shared/firebase_ui_shared.dart' show ButtonVariant;
-
 import 'src/actions.dart';
 import 'src/oauth_providers.dart';
 import 'src/providers/auth_provider.dart';
 
+export 'package:firebase_ui_shared/firebase_ui_shared.dart' show ButtonVariant;
+
 export 'src/actions.dart';
 export 'src/auth_controller.dart' show AuthAction, AuthController;
 export 'src/auth_flow.dart';
@@ -37,7 +37,6 @@ export 'src/flows/email_flow.dart';
 export 'src/flows/email_link_flow.dart';
 export 'src/flows/oauth_flow.dart' show OAuthController, OAuthFlow;
 export 'src/flows/phone_auth_flow.dart';
-export 'src/flows/universal_email_sign_in_flow.dart';
 // ignore_for_file: use_build_context_synchronously
 
 export 'src/mfa.dart' show startMFAVerification;
@@ -62,12 +61,10 @@ export 'src/screens/profile_screen.dart' show ProfileScreen;
 export 'src/screens/register_screen.dart';
 export 'src/screens/sign_in_screen.dart';
 export 'src/screens/sms_code_input_screen.dart';
-export 'src/screens/universal_email_sign_in_screen.dart';
 export 'src/styling/style.dart' show FirebaseUIStyle;
 export 'src/styling/theme.dart' show FirebaseUITheme;
 export 'src/views/different_method_sign_in_view.dart';
 export 'src/views/email_link_sign_in_view.dart';
-export 'src/views/find_providers_for_email_view.dart';
 export 'src/views/forgot_password_view.dart';
 export 'src/views/login_view.dart';
 export 'src/views/phone_input_view.dart';

packages/firebase_ui_auth/lib/src/flows/universal_email_sign_in_flow.dart

@@ -3,8 +3,8 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:firebase_auth/firebase_auth.dart' as fba;
-import 'package:flutter/material.dart';
 import 'package:firebase_ui_auth/firebase_ui_auth.dart';
+import 'package:flutter/material.dart';
 
 /// Default error handler that starts MFA flow
 /// if [FirebaseAuthMultiFactorException] is thrown.
@@ -134,29 +134,6 @@ abstract class AuthProvider<T extends AuthListener,
     }
   }
 
-  /// Fetches available providers for the given [email].
-  @Deprecated(
-    'Email enumeration protection is on by default.'
-    'Read more here https://cloud.google.com/identity-platform/docs/admin/email-enumeration-protection',
-  )
-  void findProvidersForEmail(
-    String email, [
-    fba.AuthCredential? credential,
-  ]) {
-    authListener.onBeforeProvidersForEmailFetch();
-
-    auth
-        .fetchSignInMethodsForEmail(email)
-        .then(
-          (methods) => authListener.onDifferentProvidersFound(
-            email,
-            methods,
-            credential,
-          ),
-        )
-        .catchError(authListener.onError);
-  }
-
   /// {@template ui.auth.auth_provider.on_credential_received}
   /// A method that is called when the user has successfully completed the
   /// authentication process and decides what to do with the obtained