update spec

spec/models/blank_contract_spec.rb

@@ -42,7 +42,6 @@ describe BlankContract do
       material_release = create(:material_release_with_contract_template, project: project, person_name: 'Jane Doe')
       result = render_contract_html_for(material_release)
 
-      expect(result).to include 'serial-number'
       expect(result).to include 'DO NOT COPY'
     end
   end