Fix annotations on zend db

See https://scrutinizer-ci.com/g/link0/profiler/inspections/d0f2c947-c70b-424b-9a18-58ddcf5b2f25/issues/files/src/Link0/Profiler/PersistenceHandler/ZendDbHandler.php?status=new&orderField=path&order=asc
This is a major BC break and I will have to remove it on merge.