net-p2p/transmission{,-components}: Update 4.1.1 => 4.1.2

This is a bugfix release. It fixes 20+ bugs and
has a few performance improvements too. All users
are encouraged to upgrade to this version.

Changelog:
https://github.com/transmission/transmission/releases/tag/4.1.2

PR: 295871
Reported by: Rafe Sadler <mondo.debater_0q@icloud.com> (maintainer)
Approved by: osa, vvd (Mentors, implicit)
MFH: 2026Q2

(cherry picked from commit 3d4e19e014be4a01570acb86e65b41edb6f09844)