Fix rubocop errors

spec/services/resource_events/change_state_service_spec.rb

@@ -32,13 +32,13 @@ RSpec.describe ResourceEvents::ChangeStateService do
       end
 
       it "sets the created_at timestamp from the system_note_timestamp" do
-        Timecop.freeze do
-          resource.system_note_timestamp = Time.at(43)
+        freeze_time do
+          resource.system_note_timestamp = Time.at(43).utc
 
           described_class.new(user: user, resource: resource).execute(status: state, mentionable_source: source)
           event = resource.resource_state_events.last
 
-          expect(event.created_at).to eq(Time.at(43))
+          expect(event.created_at).to eq(Time.at(43).utc)
         end
       end
     end