The old upstream homepage and repo are dead; this moves them to the new home.
The latest release version is 1.5, but that does not contain several
important commits, including support for Brother's latest "standard"
label makers, so this moves to the latest commit. Log here:
https://git.familie-radermacher.ch/linux/ptouch-print.git/log/
See original effort to update to 1.5 here; most of the changes are
from this original PR:
https://github.com/NixOS/nixpkgs/pull/197981