Allow FactoryBot to set primary key attributes

We have at least model (Language) which does not use datbase
generated primary keys so we need to be able to set them.

https://github.com/thoughtbot/factory_bot_rails/pull/419

config/environments/test.rb

@@ -67,4 +67,7 @@ Rails.application.configure do
 
   # Use the test adapter for ActiveJob during testing.
   config.active_job.queue_adapter = :test
+
+  # Allow FactoryBot to set primary key attributes
+  config.factory_bot.reject_primary_key_attributes = false
 end