[JENKINS-73663] Fix pom flattening so that parent deps are included now

[uhafner]

Fix POM flattening configuration: now all artifacts are correctly added to the list of dependencies.

See JENKINS-73663

[github-actions]

☀️   Quality Monitor

   🚦   Tests: 100 % successful (✔️ 1283 passed, 🙈 2 skipped)
   〰️   Line Coverage: 94% (410 missed lines)
   ➰   Branch Coverage: 88% (256 missed branches)
     CheckStyle: No warnings
     PMD: No warnings
     SpotBugs: No warnings

Created by Quality Monitor v1.9.0 (#00b9b1a). More details are shown in the GitHub Checks Result.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.74%. Comparing base (bb36192) to head (3fb44ba).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1087   +/-   ##
=========================================
  Coverage     90.74%   90.74%           
  Complexity     2322     2322           
=========================================
  Files           355      355           
  Lines          6551     6551           
  Branches        675      675           
=========================================
  Hits           5945     5945           
  Misses          410      410           
  Partials        196      196           

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