Upgrade chef-zero to 4.8.0
Removes the need to patch chef-zero: https://github.com/chef/chef-zero/blob/master/CHANGELOG.md
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Removes the need to patch chef-zero: https://github.com/chef/chef-zero/blob/master/CHANGELOG.md