Apart from the fact that libzypp 17.24.2 for Leap 15.2 from, e.g., https://download.opensuse.org/repositories/zypp:/SLE-15-SP2-Branch/openSUSE_Leap_15.2/ works for me, I do not see any corresponding update in the queue: https://build.opensuse.org/projects/openSUSE:Maintenance/maintenance_incidents