fix: enable latest syntax when parsing for ssr

close #2526

Author: yyx990803

packages/vite/src/node/ssr/ssrTransform.ts

@@ -33,7 +33,7 @@ export async function ssrTransform(
 
   const ast = parser.parse(code, {
     sourceType: 'module',
-    ecmaVersion: 2020,
+    ecmaVersion: 2021,
     locations: true
   }) as any