feat(update-licence-dates): add a new command to update licence date in all py files.

3 jobs for topic/default/licence_date in 52 seconds (queued for 10 seconds)
Name Stage Failure
black-check Test
would reformat /builds/cubicweb/cube-doctor/cube_doctor/__init__.py
Oh no! 💥 💔 💥
1 file would be reformatted, 19 files would be left unchanged.
ERROR: InvocationError for command /builds/cubicweb/cube-doctor/.tox/black/bin/black --check . (exited with code 1)
___________________________________ summary ____________________________________
ERROR: black: commands failed
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: command terminated with exit code 1