Use Hash#key instead of Hash#invert

ee/lib/ee/api/entities.rb

@@ -862,8 +862,8 @@ module EE
       class ManagedLicense < Grape::Entity
         expose :id, :name
         expose :classification, as: :approval_status do |policy|
-          SoftwareLicensePolicy::APPROVAL_STATUS.invert
-            .fetch(policy.classification, policy.classification)
+          SoftwareLicensePolicy::APPROVAL_STATUS.key(policy.classification) ||
+            policy.classification
         end
       end