test: fix internet/test-dns

internet/test-dns is failing due to a typo that inadvertently sends a
boolean instead of a regular expression.

PR-URL: https://github.com/nodejs/node/pull/40083


Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Qingyu Deng <i@ayase-lab.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>