The old version takes up 60GB of disk space which we need to deploy
to all hosts building Qt. As this adds up, should use the same
tier1 images as all the other branches also use.
Task-number: QTQAINFRA-1629
Task-number: QTBUG-64729
Change-Id: I132b65c381a097333577f3132dc61b87da1c78da
Reviewed-by: Heikki Halmet <heikki.halmet@qt.io>
