Move maven plugin version to plugin management section

[uhafner]

Otherwise the version is undefined in downstream modules.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.30%. Comparing base (ab440cd) to head (486e191).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1161   +/-   ##
=========================================
  Coverage     88.30%   88.30%           
  Complexity      164      164           
=========================================
  Files            11       11           
  Lines           684      684           
  Branches         85       85           
=========================================
  Hits            604      604           
  Misses           63       63           
  Partials         17       17           

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[github-actions]

☀️   Quality Monitor

   🚦   Tests: 98 % successful (✔️ 95 passed, 🙈 2 skipped)
   〰️   Line Coverage: 91% (63 missed lines)
   ➰   Branch Coverage: 91% (19 missed branches)
     Mutation Coverage: 80% (78 survived mutations)
     CheckStyle: No warnings
     PMD: No warnings
     SpotBugs: No warnings
   🐛   Error Prone: No warnings
     OWASP Dependency Check: No warnings

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