test: well-defined DH groups now verify clean

OpenSSL 1.1.1d no longer generates warnings for some DH groups that used
to be considered unsafe. See below for discussion. This is considered a
bug fix.

See:
- https://github.com/openssl/openssl/pull/9363
- https://github.com/openssl/openssl/pull/9363#discussion_r324802618

PR-URL: https://github.com/nodejs/node/pull/29550


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Anna Henningsen <anna@addaleax.net>