Fix: Require ext-pdo_pgsql

[localheinz]

This pull request

• requires ext-pdo_pgsql

Follows #902.

[codecov]

Codecov Report

Merging #912 (b97c935) into main (3721eda) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##                main      #912   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity         4         4           
===========================================
  Files              1         1           
  Lines              9         9           
===========================================
  Hits               9         9           

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