dns/{,py}ldns, dns/p5-DNS-Ldns: update 1.8.3 → 1.8.4

The most prominent fix is for the bug where ldns would, under certain
conditions, use a commented out resolver in /etc/resolv.conf:
https://github.com/NLnetLabs/ldns/issues/237

Changelog:
https://github.com/NLnetLabs/ldns/blob/1.8.4/Changelog

PR: 280404 278721
MFH: 2024Q3