testing/k0sctl: upgrade to 0.13.2
Add some Make variables that set the correct version and remove the git commit from the resulting binary. It was misleading, as it captured the git revision from aports, not from k0sctl.
Before (using k0sctl 0.13.0-r2):
$ k0sctl version
version: dev
commit: 5d7cc77
After this commit:
$ k0sctl version
version: v0.13.2
commit: