Remove agafua-syslog dependency

[bgrozev]

The syslog handler was already commented out in logging.properties — remove the unused dependency and the related dead config.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 26.38%. Comparing base (aec451b) to head (84c0fb8).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1275   +/-   ##
=========================================
  Coverage     26.38%   26.38%           
  Complexity      474      474           
=========================================
  Files           126      126           
  Lines          7861     7861           
  Branches       1213     1213           
=========================================
  Hits           2074     2074           
  Misses         5478     5478           
  Partials        309      309           

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