git: ac2d088aae92..9c78088348bc - vendor/atf - vendor branch updated

From: Enji Cooper <ngie_at_FreeBSD.org>
Date: Tue, 22 Sep 2026 07:07:30 UTC
The branch vendor/atf has been updated by ngie:

URL: https://cgit.FreeBSD.org/src/log/?id=ac2d088aae92..9c78088348bc

9c78088348bc atf: import atf-0.26