net: remove usage of require('util')

Use `require('internal/util/inspect').inspect` and
`require('internal/util/debuglog').debuglog` instead of
`require('util').debuglog` and `require('util').inspect`.

PR-URL: https://github.com/nodejs/node/pull/26807
Refs: https://github.com/nodejs/node/issues/26546


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>