Upgrade dev.gitlab.org db to PG 11
Auto-upgrade was turned off on April 17 with: touch /etc/gitlab/disable-postgresql-upgrade
. So it remains on PG 10.
We don't want the upgrade running this weekend, as there will be less staff around to handle any failures, and the Delivery team will be needing dev.gitlab.org operational for the 12.10 release work this weekend.
After this weekend, we can either upgrade it manually. Or remove the disable and let the auto-upgrade handle it during the nightly deploy.