Upgrade to Postgres 16.6 for client libraries, openssl 3.2

What does this MR do?

BACKPORT:

Upgrade to Postgres 16.6 for client libraries, openssl 3.2

Upgrade client libraries and programs to 16.6

https://www.postgresql.org/docs/release/16.6/

This does not affect servers, and allows access, backup and restore for to servers at matching major version or earlier. This supports functioning with OpenSSL 3.2+, as of PG 15.6+.

Changelog: changed

Related issues

Related to #2126 (closed)

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion

Required

• Merge Request Title, and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
• MR has a green pipeline on GitLab.com
• When ready for review, MR is labeled "~workflow::ready for review" per the Distribution MR workflow

Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
• Documentation created/updated
• Integration tests added to GitLab QA
• The impact any change in container size has should be evaluated
• New dependencies are managed with GitLab forked renovatebot