dns: refactor lib/internal/dns/utils.js

* alphabetize contenst of `resolverKeys` array
* less line-wrapping for increased code clarity

PR-URL: https://github.com/nodejs/node/pull/27006


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