Change set to let_it_be in ee/spec/policies

ee/spec/policies/ci/build_policy_spec.rb

@@ -35,7 +35,7 @@ describe Ci::BuildPolicy do
 
   describe 'manage a web ide terminal' do
     let(:build_permissions) { %i[read_web_ide_terminal create_build_terminal update_web_ide_terminal create_build_service_proxy] }
-    set(:maintainer) { create(:user) }
+    let_it_be(:maintainer) { create(:user) }
     let(:owner) { create(:owner) }
     let(:admin) { create(:admin) }
     let(:maintainer) { create(:user) }

ee/spec/policies/project_policy_spec.rb

@@ -5,12 +5,12 @@ require 'spec_helper'
 describe ProjectPolicy do
   include ExternalAuthorizationServiceHelpers
 
-  set(:owner) { create(:user) }
-  set(:admin) { create(:admin) }
-  set(:maintainer) { create(:user) }
-  set(:developer) { create(:user) }
-  set(:reporter) { create(:user) }
-  set(:guest) { create(:user) }
+  let_it_be(:owner) { create(:user) }
+  let_it_be(:admin) { create(:admin) }
+  let_it_be(:maintainer) { create(:user) }
+  let_it_be(:developer) { create(:user) }
+  let_it_be(:reporter) { create(:user) }
+  let_it_be(:guest) { create(:user) }
   let(:project) { create(:project, :public, namespace: owner.namespace) }
 
   subject { described_class.new(current_user, project) }