Update docker.io/library/postgres Docker tag to v18.4

[red-hat-konflux]

This PR contains the following updates:

Package	Type	Update	Change
docker.io/library/postgres	final	minor	18.3 → 18.4

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Documentation

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.02%. Comparing base (7cc914e) to head (60dc898).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2280   +/-   ##
=======================================
  Coverage   59.02%   59.02%           
=======================================
  Files         147      147           
  Lines        9327     9327           
=======================================
  Hits         5505     5505           
  Misses       3248     3248           
  Partials      574      574           

Flag	Coverage Δ
unittests	59.02% <ø> (ø)

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