chore: add line break

Author: sapphi-red

packages/vite/src/node/__tests__/plugins/css.spec.ts

@@ -56,6 +56,7 @@ describe('search css url function', () => {
       ),
     ).toBe(true)
   })
+
   test('should capture the full url with escaped parentheses', () => {
     const css = 'background-image: url(public/awkward-name\\)2.png);'
     const match = cssUrlRE.exec(css)