dns/powerdns: update to 5.0.4 (fixes multiple CVE's)

Changelog: https://doc.powerdns.com/authoritative/changelog/5.0.html#change-5.0.4

PR: 294748
Event: Wiesbaden Hackathon 202604
Security: PowerDNS Security Advisory 2026-05
MFH: 2026Q2
(cherry picked from commit a3ae2c6915a9ff1fc6b3205f5af5e55707366703)