security/clamav-lts: update 1.4.3 -> 1.4.4
Reported by: Andrea Venturoli <ml@netfence.it>, Helge Oldach <freebsd@oldach.net>
Changes: https://blog.clamav.net/2026/03/clamav-152-and-144-security-patch.html
Security: CVE-2026-20031
MFH: 2026Q1
(cherry picked from commit be29dc78bb6b22473f2e35db37f98a7e16c5bed3)