Update Gradle action usage in CI workflow

[msridhar]

• Remove use of deprecated patterns and actions (see here)
• Add wrapper validation for further safety

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.17%. Comparing base (2702465) to head (a45f1dd).

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #969   +/-   ##
=========================================
  Coverage     86.17%   86.17%           
  Complexity     2037     2037           
=========================================
  Files            81       81           
  Lines          6691     6691           
  Branches       1290     1290           
=========================================
  Hits           5766     5766           
  Misses          515      515           
  Partials        410      410           

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