chore(flake8): remove format=pylint option for a better output

Hello dear contributors,

This is an auto generated modification to help you improve the code base of logilab. If this commit is bad don't hesitate to close this MR and report it here https://forge.extranet.logilab.fr/cubicweb/cube-doctor/-/issues.

Kind regards,

added To Review label

enabled an automatic merge when the pipeline for e7ec30928ed9 succeeds

requested review from @famarger

approved this merge request

merged