git: 788f701923e8..9b26803758e9 - vendor/xz - vendor branch updated

From: Xin LI <delphij_at_FreeBSD.org>
Date: Sun, 13 Sep 2026 22:47:03 UTC
The branch vendor/xz has been updated by delphij:

URL: https://cgit.FreeBSD.org/src/log/?id=788f701923e8..9b26803758e9

9b26803758e9 Vendor import of xz 5.8.4 (trimmed)