lib: fix grammar in internal/bootstrap/loaders.js

PR-URL: https://github.com/nodejs/node/pull/33211


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>