GH WF: Adopt to gradle-build-action 2.2

[snazy]

• Default to cache-read-only for non-default branches

[codecov]

Codecov Report

Merging #198 (5663af5) into main (424a8d5) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #198   +/-   ##
=========================================
  Coverage     80.37%   80.37%           
  Complexity     1835     1835           
=========================================
  Files           100      100           
  Lines          7899     7899           
  Branches       1143     1143           
=========================================
  Hits           6349     6349           
  Misses         1033     1033           
  Partials        517      517           

Flag	Coverage Δ
java	80.37% <ø> (ø)

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