📦 Update dependency mocha to v8.4.0 (#34270)

Author: renovate-bot

validator/js/gulpjs/package.json

@@ -22,7 +22,7 @@
   },
   "devDependencies": {
     "gulp": "4.0.2",
-    "mocha": "8.3.2"
+    "mocha": "8.4.0"
   },
   "scripts": {
     "test": " ./node_modules/mocha/bin/mocha",