dns/powerdns: update to 4.8.2

In Authoritative Server 4.8, the LMDB backend gains a new Lightning
Stream-compatible schema, which requires a data migration (this is
automatic, and there is no migration back to the old schema). LMDB
backend users should pay extra attention to the Upgrade Notes at
https://doc.powerdns.com/authoritative/upgrading.html.

Changelog: https://blog.powerdns.com/2023/09/07/authoritative-server-4-8-2

PR: 273709