ci: pg11 image url has changed

cube-doctor requested to merge topic/default/new-pg11-image into branch/default

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,

Edited by Laurent Peuch

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