Upgrade to Postgres 16.6 for client libraries, openssl 3.2

What does this MR do?

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