package/clamav: security bump version to 0.103.7
Release notes:
https://blog.clamav.net/2022/07/clamav-01037-01041-and-01051-patch.html
By bumping the vendored UnRAR library to version 6.1.7 in commit
https://github.com/Cisco-Talos/clamav/commit/b709eac4003ad01b609615cbbb86c7d5b3821d92
CVE-2022-30333 was fixed.
Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>