Update maven-checkstyle-plugin.version

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.apache.maven.plugins:maven-checkstyle-plugin (source)	3.3.0 → 3.6.0

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.18%. Comparing base (53ef1fe) to head (af60578).

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #25   +/-   ##
=========================================
  Coverage     38.18%   38.18%           
  Complexity        4        4           
=========================================
  Files             5        5           
  Lines            55       55           
=========================================
  Hits             21       21           
  Misses           34       34           

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