[ClamAV] Update to 0.103.4 (#4314)

* [ClamAV] Update to 0.103.4

ClamAV 0.103.4 is a critical patch release, see https://blog.clamav.net/2021/11/clamav-01034-and-01041-patch-releases.html for more information.

* Update docker-compose.yml

Update mailcow/clamd:1.42

data/Dockerfiles/clamd/Dockerfile

@@ -2,8 +2,7 @@ FROM debian:buster-slim
 
 LABEL maintainer "André Peters <andre.peters@servercow.de>"
 
-ARG CLAMAV=0.103.3
-
+ARG CLAMAV=0.103.4
 RUN apt-get update && apt-get install -y --no-install-recommends \
   ca-certificates \
   zlib1g-dev \