[devtools] fix sorting in ExecutionPlan._check_permissions on python3 Sort lists instead of dict_items objects to get predictable results. With this change, unittest_querier.UtilsTC.test_preprocess_security passes every time instead of once in a blue moon. Closes #11759133.

version=3
opts=uversionmangle=s/(rc|a|b|c)/~$1/ \
https://pypi.debian.net/cubicweb/cubicweb-(.+)\.(?:zip|tgz|tbz|txz|(?:tar\.(?:gz|bz2|xz)))