Bump tested pg versions in preparation for PG15
What does this MR do and why?
Since we're going to postgres 14 on gitlab.com, we should make that the primary version we test against, and we should add nightly tests for postgres 15.
Describe in detail what your merge request does and why.
- Swap PG 14 to be default, and 13 to be nightly.
- Add nightly tests for PG 15
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #402982 (closed)
Edited by Leonardo da Rosa