git: 46780ea2dc97..f6a891c2b422 - vendor/xz - vendor branch updated

From: Xin LI <delphij_at_FreeBSD.org>
Date: Sun, 01 Jan 2023 04:23:56 UTC
The branch vendor/xz has been updated by delphij:

URL: https://cgit.FreeBSD.org/src/log/?id=46780ea2dc97..f6a891c2b422

f6a891c2b422 Vendor import of xz 5.4.0 (trimmed)