fix: replace Hash.except with reject

Hash.except is missing in Ruby 2.7 we have in Puppet/OpenVox v7.

Author: jay7x

lib/puppet/provider/gitlab_application_settings/gitlab_application_settings.rb

@@ -28,7 +28,7 @@ def set(context, changes, noop: false)
     changes.each do |name, change|
       should = change[:should]
       context.debug("changes to apply: #{should}")
-      data = should.except(:name)
+      data = should.reject { |k, _v| k == :name }
 
       context.updating(name) do
         @api_helper.put_json('/application/settings', data) unless noop