Update factories to use dynamic attributes

Static attributes are deprecated in FactoryBot 4.x and removed on 5.x.
https://thoughtbot.com/blog/deprecating-static-attributes-in-factory_bot-4-11

ee/spec/factories/projects.rb

@@ -83,7 +83,7 @@ FactoryBot.modify do
     end
 
     trait :github_imported do
-      import_type 'github'
+      import_type { 'github' }
     end
   end
 end