Update default PostgreSQL to 16

Dustin Collinsrequested to merge
5862-update-default-postgres-16 into master

What does this MR do?

Update default PostgreSQL version to 16.

Note this MR cannot be merged until %18.0 but was created early to run tests.

Related issues

Relates to Update charts default postgresql to PG 16 (#5862 - closed)

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Required

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  • Merge Request Title and Description are up to date, accurate, and descriptive.
  • MR targeting the appropriate branch.
  • MR has a green pipeline.
  • Documentation created/updated.
  • Tests added/updated, and test plan for scenarios not covered by automated tests.
  • Equivalent MR/issue for omnibus-gitlab opened.

Reviewers checklist

Edited by Clemens Beck

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