Run tests against PG11 for MRs, master, nightly; PG10 for master, nightly
Based on omnibus-gitlab#5092 (closed), we should switch the current testing strategy for PG10 and PG11 rspec jobs since PG11 will be the default starting with %12.10.
Based on omnibus-gitlab#5092 (closed), we should switch the current testing strategy for PG10 and PG11 rspec jobs since PG11 will be the default starting with %12.10.