Support new non-free repository component for Debian bookworm and newer

If the --non-free option gets enabled packages like 'firmware-linux',
'firmware-linux-nonfree', 'firmware-misc-nonfree' should be available.
Starting with Debian/bookworm the firmware related packages got moved
from "non-free" to the new "non-free-firmware" component/repository though
(related to https://www.debian.org/vote/2022/vote_003).