see if 8s timeout helps

Author: stanley-cheung

packages/grpc-web/package.json

@@ -14,7 +14,7 @@
     "build": "node scripts/build.js",
     "prepare": "npm run build && require-self",
     "prepublishOnly": "npm run build",
-    "test": "mocha --timeout 5000 \"./test/**/*_test.js\""
+    "test": "mocha --timeout 8000 \"./test/**/*_test.js\""
   },
   "license": "Apache-2.0",
   "devDependencies": {