docs(licence): update licence dates

4 jobs for branch/default in 52 seconds (queued for 15 seconds)
Name Stage Failure
flake8 Lint
ERROR: InvocationError for command /builds/cubicweb/cubes/bootstrap/.tox/flake8/bin/python -m flake8 . (exited with code 1)
___________________________________ summary ____________________________________
ERROR: flake8: commands failed
Uploading artifacts for failed job
Uploading artifacts...
gl-code-quality-report.json: found 1 matching files and directories

Uploading artifacts as "codequality" to coordinator... ok
id=495819 responseStatus=201 Created token=RsEQAewT
Cleaning up file based variables
ERROR: Job failed: command terminated with exit code 1