sysutils/snapraid: update to 14.2

A bug fix release for an issue on some Linux file systems (such as
F2FS) where posix_fadvise() can fail in unexpected ways. While we
are not known to be affected, it is conceivable that something like
this happens with a FUSE filesystem.

Changelog: https://github.com/amadvance/snapraid/releases/tag/v14.2

MFH: 2026Q2
(cherry picked from commit 72eeb47d4a2b24e7ec6894ac64e9171d4ecdca32)