pkgctl version check exits without output in non-terminal environments

as discovered by @txtsd and me on IRC pkgctl version check currently can't be run in CI (i.e. github actions) since it just exits without output when TERM is empty:

$ pkgctl version check 
Up-to-date
 ✓ prowlarr-bin: current version 1.24.3.4754 is latest
$ export TERM=
$ pkgctl version check
<no output>

This is quite confusing and there should be some fallback or atleast an error implemented when we hit this case and can't display as usual. We could raise an error and point to the functionality requested in Issue #237 (closed) after it is implemented 😊