dns/powerdns: update to 4.8.3

Changelog: https://doc.powerdns.com/authoritative/changelog/4.8.html#change-4.8.3
Upgrade guide: https://doc.powerdns.com/authoritative/upgrading.html#any-version-to-4-8-x
(nothing new going from 4.8.2 to 4.8.3)

PR: 274369