Update CI tags to consistently use 9.X runners
Update to CI tag for selecting consistent GitLab runners (9.X)
See https://cern.service-now.com/service-portal/view-outage.do?n=OTG0043129 for more details about recent changes.
Also, https://cern.service-now.com/service-portal/view-outage.do?n=OTG0044665 describing the new 11.X runners being used
There seem to still be some issues with the new 11.X runners, see for example
https://gitlab.cern.ch/atlas-physics/higgs/hww/HWWAnalysisCode/issues/12
so for now use 9.X runners.
Edited by David Richard Shope