net/routinator: Security update 0.15.1 => 0.15.2

Release Notes:
https://www.nlnetlabs.nl/news/2026/Jun/08/routinator-0.15.2-released/
Changelog:
https://github.com/NLnetLabs/routinator/blob/v0.15.2/Changelog.md

PR: 295979
MFH: 2026Q2
Security: CVE-2026-49232
Security: CVE-2026-49233
Security: CVE-2026-49234
Security: CVE-2026-49235
Approved by: osa, vvd (Mentors, implicit)