Increase max_connections for postgresql in gdk CI

Harsha Muralidharrequested to merge
hm-postgres-max-connections-gdk-pipeline into master

What does this MR do and why?

Tries to address environment failures in MR pipelines such as https://gitlab.com/gitlab-org/gitlab/-/jobs/10310565779

This is needed in light of !193720 (merged)

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