Remove unnecessary freezes

ee/spec/features/admin/admin_sends_notification_spec.rb

@@ -9,7 +9,7 @@ describe "Admin sends notification", :js, :sidekiq_might_not_need_inline do
   let(:user) { create(:user) }
 
   before do
-    stub_const('NOTIFICATION_TEXT', 'Your project has been moved.'.freeze)
+    stub_const('NOTIFICATION_TEXT', 'Your project has been moved.')
 
     group.add_developer(user)
 

ee/spec/features/user_unsubscribes_from_admin_notifications_spec.rb

@@ -7,7 +7,7 @@ describe "Admin unsubscribes from notification" do
   let_it_be(:urlsafe_email) { Base64.urlsafe_encode64(user.email) }
 
   before do
-    stub_const('NOTIFICATION_TEXT', 'You have been unsubscribed from receiving GitLab administrator notifications.'.freeze)
+    stub_const('NOTIFICATION_TEXT', 'You have been unsubscribed from receiving GitLab administrator notifications.')
 
     sign_in(user)