security: check xc-utils versions

[der.hans]

moin moin,

someone patched a potential remote exploit into xz-utils. It seems it can
compromise sshd.

The exploit was added in February affecting versions 5.6.0 and 5.6.1, but
the exploiter has been around a while, so watch for updates.

https://www.openwall.com/lists/oss-security/2024/03/29/4

https://lists.debian.org/debian-security-announce/2024/msg00057.html

https://www.redhat.com/en/blog/urgent-security-alert-fedora-41-and-rawhide-users

ciao,

der.hans
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