net/routinator: update to 15.1
Release Announcement: https://nlnetlabs.nl/news/2025/Oct/07/routinator-0.15.1-released/
Changelog: https://github.com/NLnetLabs/routinator/blob/v0.15.1/Changelog.md
PR: 290107
Reported by: Jaap Akkerhuis <jaap@NLnetLabs.nl> (maintainer)