Ajout de PHP_CodeSniffer aux dépendances

Change-Id: I4768210d449959b1fd65121a44025a76d5d560e9
Reviewed-on: https://vigilo-dev.si.c-s.fr/review/2366
Tested-by: Build system <qa@vigilo-dev.si.c-s.fr>
Reviewed-by: Francois POIROTTE <francois.poirotte@c-s.fr>