Upgrade GDK image PostgreSQL to 13
What does this MR do and why?
To keep PostgreSQL up-to-date with GDK defaults in the image that will used for testing against GDK in gitlab-org/gitlab
pipelines.
Checklist
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(If applicable) Add patches if required for upgrading Ruby version in https://gitlab.com/gitlab-org/gitlab-build-images/-/tree/master/patches/ruby.
Edited by Mark Lapierre