chaiwala-apparmor-profiles: Fix conflict with pulseaudio in Buster

The version of the pulseaudio package in Buster has no epoch, so Breaks: pulseaudio (<< 1:8.0-0ubuntu3co4~) causes APT to uninstall pulseaudio or chaiwala-apparmor-profiles when the other is installed.

With the curren recipes this causes chaiwala-apparmor-profiles to be removed as pulseaudio is installed later.

Drop the reference to old Ubuntu versions both for pulseaudio and apparmor now that we moved on top of Debian Buster.