devel/objfw: Update 1.4.1 => 1.5.7
Commit log:
https://git.nil.im/ObjFW/ObjFW/compare/1.4.1-release...1.5.7-release
PR: 296526
Approved by: osa, vvd (Mentors, implicit)
MFH: 2026Q2
(cherry picked from commit 62835f0853d15875214a299c049dc8a2d9a4ac1b)