slapos_web_deploy: support Ubuntu24.04

This is a fixup of 3194cc75.
8 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS-Master.UnitTest-Master

02:03:34

failed SlapOS.Eggs.UnitTest-Master.Python2

00:23:26

failed SlapOS.Eggs.UnitTest-Master.Python3

00:24:49

passed SlapOS-Master.UnitTest-Master

01:36:32

failed SlapOS-Master.UnitTest-Master

02:21:56

passed SlapOS-Master.UnitTest-Master

01:31:33

failed SlapOS.Eggs.UnitTest-Master.Python2

00:26:11

passed SlapOS.Eggs.UnitTest-Master.Python3

00:24:21