clamav: Update to 1.2.1

clamav: Update to 1.2.1

For details see:
https://blog.clamav.net/2023/10/clamav-121-113-104-010311-patch.html

Excerpt:

"ClamAV 1.2.1 is a patch release with the following fixes:

    Eliminate security warning about unused "atty" dependency.

    Upgrade the bundled UnRAR library (libclamunrar) to version 6.2.12.

    Build system: Fix link error with Clang/LLVM/LLD version 17. Patch courtesy of Yasuhiro Kimura.

    Fix alert-exceeds-max feature for files > 2GB and < max-filesize."

Signed-off-by: Matthias Fischer <matthias.fischer@ipfire.org>
Reviewed-by: Adolf Belka <adolf.belka@ipfire.org>