Bump pg versions used in CI to 15.14, 16.10, 17.6

[fabriziomello]

Those changes will affect only Linux and macOS CI workflows. For Windows we use chocolatey packages and it remains in 15.12, 16.8 and 17.4.

[github-actions]

@kpan2034, @Poroma-Banerjee: please review this pull request.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.33%. Comparing base (3aba0d6) to head (1872ca9).
⚠️ Report is 87 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8491      +/-   ##
==========================================
+ Coverage   82.29%   82.33%   +0.04%     
==========================================
  Files         248      248              
  Lines       47335    47307      -28     
  Branches    12044    12040       -4     
==========================================
- Hits        38956    38952       -4     
- Misses       3498     3528      +30     
+ Partials     4881     4827      -54     

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[svenklemm]

Since we run against older pg versions in our nightly tests I dont think this is sufficient. Did you check whether nightly tests pass with this change?

[fabriziomello]

Since we run against older pg versions in our nightly tests I dont think this is sufficient. Did you check whether nightly tests pass with this change?

You're right... fixed it to be deterministic even across different upstream versions.