Add non-free component to security.debian.org repository of old Debia…

…n releases

AFAIK those components used to be missing in the past, but nowadays
they are provided as such, even when being empty. Unify the
configuration by enabling the same components as used for non-security
repository.

etc/grml/fai/config/files/etc/apt/sources.list.d/debian.list/DEBIAN_BUSTER

@@ -3,5 +3,5 @@
   deb-src http://ftp.debian.org/debian/ buster main contrib non-free
 
 # security updates:
-  deb     http://security.debian.org/ buster/updates main contrib
-  deb-src http://security.debian.org/ buster/updates main contrib
+  deb     http://security.debian.org/ buster/updates main contrib non-free
+  deb-src http://security.debian.org/ buster/updates main contrib non-free

etc/grml/fai/config/files/etc/apt/sources.list.d/debian.list/DEBIAN_STABLE

@@ -3,8 +3,8 @@
   deb-src http://ftp.debian.org/debian/ stable main contrib non-free
 
 # security updates:
-  deb     http://security.debian.org/debian-security stable-security main
-  deb-src http://security.debian.org/debian-security stable-security main
+  deb     http://security.debian.org/debian-security stable-security main contrib non-free
+  deb-src http://security.debian.org/debian-security stable-security main contrib non-free
 
 # backports:
   deb     http://ftp.debian.org/debian/ bullseye-backports main contrib non-free