www/hiawatha: Update 12.0 => 12.1
Release Notes:
https://hiawatha.leisink.net/changelog
PR: 294302
Reported by: Paavo-Einari Kaipila <pkaipila@gmail.com> (maintainer)
Approved by: osa, vvd (mentors)
MFH: 2026Q2
(cherry picked from commit 71e41147e4cb605cea592d745df3bb0a65652e63)