Update gradle checkstyle version to 11.0.0

[Luoq1-Xu]

Closes #237

Upgraded Checkstyle version to 11.0.0

11.0.0 is stable compatible with all JDK 17 and above.
Tested and observed that the new checkstyle version works without issues, with the current checkstyle.xml.

[canihasreview]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.26%. Comparing base (8133099) to head (1c286b1).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #238   +/-   ##
=========================================
  Coverage     75.26%   75.26%           
  Complexity      419      419           
=========================================
  Files            71       71           
  Lines          1338     1338           
  Branches        126      126           
=========================================
  Hits           1007     1007           
  Misses          301      301           
  Partials         30       30           

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[damithc]

Thanks for this PR, @Luoq1-Xu
I missed it earlier.