GitHub Actions: Remove gradle/actions/wrapper-validation because validation is performed by default in gradle/actions/setup-gradle@v4

[sadv1r]

This step is no longer necessary, as setup-gradle@v4 will now handle the same wrapper validation.

From the Build action log of this PR without wrapper-validation:

All Gradle Wrapper jars are valid
  ✓ Found known Gradle Wrapper JAR files:
    2db75c40782f5e8ba1fc278a5574bab070adccb2d21ca5a6e5ed840888448046 gradle/wrapper/gradle-wrapper.jar

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.58%. Comparing base (adad639) to head (5414972).
Report is 140 commits behind head on next.

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Additional details and impacted files

@@           Coverage Diff           @@
##             next     #491   +/-   ##
=======================================
  Coverage   27.58%   27.58%           
=======================================
  Files           4        4           
  Lines          29       29           
=======================================
  Hits            8        8           
  Misses         21       21           

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[hsz]

Thanks, Dmitry!