Code review comment for ubuntu-archive-tools:update-output-helper

apt-cache showsrc --only-source is really bad if you have a binary name it becomes a lot more reliable, but even then it doesn't support `package/newest` sadly, or any of the / or = modifiers. I think with --only-source it literally just iterates over all Sources files in order.

But it should show you all versions, and you can use `sort-dctrl -k Version:v` from dctrl-tools to sort them by version.