security/clamav: Update to 1.4.3
ReleaseNotes: https://blog.clamav.net/2025/06/clamav-143-and-109-security-patch.html
MFH: 2025Q3
Security: 3dcc0812-4da5-11f0-afcc-f02f7432cf97
Security: 6c6c1507-4da5-11f0-afcc-f02f7432cf97
(cherry picked from commit 2c88607160fe6f0bf4e828f748c393f0cc6761fb)