dns/powerdns-recursor: update to 4.8.1 (fixes CVE-2023-22617)

ChangeLog: https://docs.powerdns.com/recursor/changelog/4.8.html#change-4.8.1

Avoid unbounded recursion when retrieving DS records from some misconfigured
domains.

PR: 269116
Reported by: tremere@cainites.net (maintainer)
MFH: 2023Q1 (security fix)
Security: CVE-2023-22617

(cherry picked from commit 2c4784a7609ff0ef908af4e533c178ca3fa026d1)