Remove Rack Attack monkey patches and bump to version 4.3.0
I finally got these monkey patches into Rack Attack v4.3.0, so GitLab no longer needs them. Hooray!
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
I finally got these monkey patches into Rack Attack v4.3.0, so GitLab no longer needs them. Hooray!