Remove util as it is a leftover from the @storybook/test move

Author: kasperpeulen

code/core/package.json

@@ -264,7 +264,6 @@
     "recast": "^0.23.5",
     "semver": "^7.6.2",
     "tempy": "^3.1.0",
-    "util": "^0.12.4",
     "ws": "^8.2.3"
   },
   "devDependencies": {