Bump the EcmaScript version in the eslint configuration.

Sunshine40 · Sunshine40 · commit d73d27348206 · 2024-06-07T07:51:29.000+08:00
diff --git a/src/librustdoc/html/static/.eslintrc.js b/src/librustdoc/html/static/.eslintrc.js
@@ -5,7 +5,7 @@ module.exports = {
     },
     "extends": "eslint:recommended",
     "parserOptions": {
-        "ecmaVersion": 8,
+        "ecmaVersion": 9,
         "sourceType": "module"
     },
     "rules": {
