Try to be consistent when we check for PostgreSQL versions

[jeltz]

In most cases we used >= but in some we used < where >= would have been equally clear. Let's try to be consistent instead.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.47%. Comparing base (283b54c) to head (33c4a6a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #661      +/-   ##
==========================================
+ Coverage   86.32%   86.47%   +0.14%     
==========================================
  Files           3        3              
  Lines        1346     1346              
  Branches      217      217              
==========================================
+ Hits         1162     1164       +2     
+ Misses         87       86       -1     
+ Partials       97       96       -1     

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