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 19.11%. Comparing base (1e3a7ac) to head (283310b).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #633   +/-   ##
=========================================
  Coverage     19.11%   19.11%           
+ Complexity      309      308    -1     
=========================================
  Files            83       83           
  Lines          7204     7204           
  Branches        958      958           
=========================================
  Hits           1377     1377           
+ Misses         5597     5595    -2     
- Partials        230      232    +2     

see 2 files with indirect coverage changes

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