package/clamav: security bump version to 0.102.4
Release notes:
https://blog.clamav.net/2020/07/clamav-01024-security-patch-released.html
Fixes CVE-2020-3481, CVE-2020-3327 & CVE-2020-3350.
Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>