Update ESLint & grunt-wordpress

Author: mgol

.eslintrc.json

@@ -5,16 +5,12 @@
 
   "reportUnusedDisableDirectives": true,
 
-  "parserOptions": {
-    "ecmaVersion": 2018
-  },
-
   "env": {
-    "es6": true,
+    "es2023": true,
     "node": true
   },
 
   "rules": {
-    "strict": ["error", "global"]
+    "strict": [ "error", "global" ]
   }
 }