feat: Upgrade gradle plugin to 4.2.1

[jcesarmobile]

Platforms affected

Motivation and Context

Description

Testing

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[BBosman]

This can be bumped to 4.2.1 :)

[jcesarmobile]

done

[codecov-commenter]

Codecov Report

Merging #1232 (cce312a) into master (6d803e2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1232   +/-   ##
=======================================
  Coverage   72.00%   72.00%           
=======================================
  Files          21       21           
  Lines        1697     1697           
=======================================
  Hits         1222     1222           
  Misses        475      475           

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[erisu]

LGTM