Meta: update metadata for ES2021

Author: ljharb

spec.html

@@ -66,7 +66,7 @@
 <pre class="metadata">
   title: ECMAScript&reg; 2021 Language&nbsp;Specification
   shortname: ECMA-262
-  status: draft
+  status: standard
   location: https://tc39.es/ecma262/
 </pre>
 <p><img src="img/ecma-logo.svg" id="ecma-logo"></p>