dns/powerdns: Update 5.1.2 => 5.1.3
While here:
- Update options' descriptions.
- Drop the backported patch, it's made into release.
Changelog:
https://doc.powerdns.com/authoritative/changelog/5.1.html#change-5.1.3
PR: 296400
Reported by: Jordan Ostreff <jordan@ostreff.info>
Approved by: Ralf van der Enden <tremere@cainites.net> (maintainer)
Approved by: osa, vvd (Mentors, implicit)
MFH: 2026Q2
(cherry picked from commit 27d147dd421dd767d40e0d069b413b55650fd095)