Fix kwargs deprecation warnings

Contributes to https://gitlab.com/gitlab-org/gitlab/-/issues/258994

spec/controllers/omniauth_callbacks_controller_spec.rb

@@ -367,8 +367,8 @@ RSpec.describe OmniauthCallbacksController, type: :controller do
 
     before do
       stub_last_request_id(last_request_id)
-      stub_omniauth_saml_config({ enabled: true, auto_link_saml_user: true, allow_single_sign_on: ['saml'],
-                                  providers: [saml_config] })
+      stub_omniauth_saml_config(enabled: true, auto_link_saml_user: true, allow_single_sign_on: ['saml'],
+                                  providers: [saml_config])
       mock_auth_hash_with_saml_xml('saml', +'my-uid', user.email, mock_saml_response)
       request.env['devise.mapping'] = Devise.mappings[:user]
       request.env['omniauth.auth'] = Rails.application.env_config['omniauth.auth']

spec/support/helpers/login_helpers.rb

@@ -198,7 +198,7 @@ module LoginHelpers
     env['omniauth.error.strategy'] = strategy
   end
 
-  def stub_omniauth_saml_config(messages, context: Rails.application)
+  def stub_omniauth_saml_config(context: Rails.application, **messages)
     set_devise_mapping(context: context)
     routes = Rails.application.routes
     routes.disable_clear_and_finalize = true