playbook: use OBS Debian 9 for all version of Debian <= 9

5 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.StandaloneDeploymentScriptTest-Debian.Bullseye

00:42:12

passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster

00:34:45

passed SlapOS-Master.StandaloneDeploymentScriptTest-Debian.Buster

00:35:58

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Bullseye

00:29:18

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster

00:25:27