git: a5913a473bb0..a509d68f27b9 - vendor/libarchive - vendor branch updated

From: Martin Matuska <mm_at_FreeBSD.org>
Date: Thu, 11 Apr 2024 13:51:32 UTC
The branch vendor/libarchive has been updated by mm:

URL: https://cgit.FreeBSD.org/src/log/?id=a5913a473bb0..a509d68f27b9

a509d68f27b9 Update vendor/libarchive to 3.7.3