dns/powerdns: Update 4.9.5 => 4.9.7
Release notes:
https://blog.powerdns.com/2025/07/07/powerdns-authoritative-server-4.9.7
Changelog:
https://doc.powerdns.com/authoritative/changelog/4.9.html#change-4.9.7
PR: 288129
MFH: 2025Q3
(cherry picked from commit 1d6ba0cdf5b2ae7d58a91edd983c4a7443ed5b8a)