Upgrade default PostgreSQL version to 11.9
Summary
11.9 release: https://www.postgresql.org/about/news/2060/
Current behavior
We currently default to 11.7
gitlab-org/omnibus-gitlab!4545 (merged)
This should be a drop in replacement, it should not require any upgrade steps. It will require a restart of database pods in order to take effect, which should happen automatically.
Edited by Takuya Noguchi