Fix Bullseye/Bookworm confusion.

[config] / bookworm / etc_files / all / etc / apt / sources.list

deb http://deb.debian.org/debian bookworm main contrib non-free
deb http://security.debian.org/debian-security bookworm-security main contrib non-free
deb http://deb.debian.org/debian bookworm-updates main contrib non-free
deb http://ftp.debian.org/debian bookworm-backports main contrib non-free