Upgrade c-icap-modules from 0.5.2 to 0.5.3

Change log:

• Add support for ClamAV 0.101.x
• Bug fix: use url-decoded string as filename on viralator mode

URL: https://sourceforge.net/p/c-icap/news/2019/01/the-c-icap-modules-053-is-released-/

Reported by: Patrik Hildingsson <patrik@hildingsson.se> (private mail)