feat(apt): Add non-free-firmware component to all repos

We're doing this because at the end of the Proxmox VE 8 lifecycle in
August of 2025 the pve8to9 migration check script indicated if would
be potentially beneficial to install the amd64-microcode package for
microcode updates to our processor.

We agree which is why we need the non-free-firmware component to be
able to install amd64-microcode.

tasks/repo-enable-non-free.yml

@@ -1,8 +1,8 @@
 # SPDX-License-Identifier: MIT
-- name: 'In ''/etc/apt/sources.list'' enable non-free component in all Debian-native repos'
+- name: 'In ''/etc/apt/sources.list'' enable non-free and non-free-firmware components in all Debian-native repos'
   ansible.builtin.replace:
     path: '/etc/apt/sources.list'
-    regexp: '^(.*?)( main contrib(?! non-free))'
-    replace: '\g<1>\g<2> non-free'
+    regexp: '^(.*?)( main contrib(?! non-free non-free-firmware))'
+    replace: '\g<1>\g<2> non-free non-free-firmware'
   notify:
     - 'apt-get update'