DO NOT USE FREEBSD-UPDATE TO UPGRADE TO 15.0-ALPHA3

<https://lists.freebsd.org/archives/freebsd-stable/2025-September/003244.html>

FreeBSD bug 289769 - libsys.so.7 not found when upgrading userland with legacy freebsd-update

<https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289769>

#FreeBSD #upgrade #alpha #test