chore: bump ESLint ecmaVersion to 2020 (mochajs#5104)

JoshuaKGoldberg · web-flow · commit b88978deb3c1 · 2024-02-27T11:30:37.000-05:00
diff --git a/eslint.config.js b/eslint.config.js
@@ -12,7 +12,7 @@ module.exports = [
   {
     ...js.configs.recommended,
     languageOptions: {
-      ecmaVersion: 2018,
+      ecmaVersion: 2020,
       globals: {
         ...globals.browser,
         ...globals.node
