proxysql: fix url

6 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
failed Cloudooo.UnitTest-Master

00:12:29

passed SlapOS.Eggs.UnitTest-Master.Python2

00:12:28

passed SlapOS.Eggs.UnitTest-Master.Python3

00:28:15

passed SlapOS.SlapRunner.ResilienceTest-Master

00:23:15

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

05:16:08

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

08:35:12