assert: do not read Node.js modules

Prevent reading a Node.js module. That could theoretically lead to
false errors being thrown otherwise.

PR-URL: https://github.com/nodejs/node/pull/18322


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>