chore: add email to updateMfaPreference API

Author: khatruong2009

packages/auth/amplify_auth_cognito_dart/lib/src/auth_plugin_impl.dart

@@ -891,13 +891,15 @@ class AmplifyAuthCognitoDart extends AuthPluginInterface
   Future<void> updateMfaPreference({
     MfaPreference? sms,
     MfaPreference? totp,
+    MfaPreference? email,
   }) async {
     final tokens = await _stateMachine.getUserPoolTokens();
     final accessToken = tokens.accessToken.raw;
     return _cognitoIdp.setMfaSettings(
       accessToken: accessToken,
       sms: sms,
       totp: totp,
+      email: email,
     );
   }