fix(debian): clean apt caches

[DDtKey]

First of all, thanks for the maintenance!

Here is a minor fix of not cleaned apt caches, see DKL-DI-0005

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Currently, the following FATAL issues are found by dockle:

> docker run --rm -v /var/run/docker.sock:/var/run/docker.sock goodwithtech/dockle:v0.4.15 --exit-code=1 --exit-level=warn clamav/clamav-debian:1.4

FATAL   - DKL-DI-0005: Clear apt-get caches
        * Use 'rm -rf /var/lib/apt/lists' after 'apt-get install|update' : RUN /bin/sh -c apt-get update && apt-get install -y         libbz2-1.0         libcurl4         libssl3         libjson-c5         libmilt
er1.0.1         libncurses6         libpcre2-8-0         libxml2         zlib1g         tzdata         netcat-openbsd     &&     rm -rf /var/cache/apt/archives &&     groupadd -g 1000 "clamav" &&     useradd -m -g
 clamav -s /bin/false --home-dir /var/lib/clamav -u 1000 -c "Clam Antivirus" clamav &&     install -d -m 755 -g "clamav" -o "clamav" "/var/log/clamav" &&     chown -R clamav:clamav /var/lib/clamav # buildkit

This PR eliminates this issue

[rsundriyal]

Looks good.

[val-ms]

I also did a local build and compared the size with a recently build 1.4 image and confirmed it a fair bit smaller. @DDtKey thank you for the help!