Gitlab software release upgrade

Upgrade Gitlab from version 8.17 to 9.5.10.

https://gitlab.com/gitlab-org/gitlab-foss/-/blob/v9.5.10/doc/install/installation.md

/reviewed-on !699
6 jobs for 1.0
Status Job ID Name Coverage
  External
passed SlapOS.SlapRunner.ResilienceTest-Master

00:24:28

running SlapOS.SlapRunner.ResilienceTest-Master.ERP5

41529:29:31

failed SlapOS.SoftwareReleases.IntegrationTest-Master

06:34:42

passed SlapOS.SlapRunner.ResilienceTest-Master

00:27:32

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

failed SlapOS.SoftwareReleases.IntegrationTest-Master