security/clamav: Update to 0.104.3

PR: 263944
Approved by: portmgr (blanket, security fixes apply according to bapt)
Security: b2407db1-d79f-11ec-a15f-589cfc0f81b0

(cherry picked from commit fb54a631b35ecda00d46925beefd66c2d019dca2)