feat(set_cubes_cw_max_version): add custom MR description

1 job for branch/default in 26 seconds (queued for 2 seconds)
Name Stage Failure
failed
auto-mr Test
Package python-pip is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
python3-pip

E: Package 'python-pip' has no installation candidate
Cleaning up file based variables
ERROR: Job failed: command terminated with exit code 1