CompatHelper: bump compat for RecursiveArrayTools to 4, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the RecursiveArrayTools package from 2, 3 to 2, 3, 4.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.69%. Comparing base (8ee15c8) to head (a2a95d2).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1240   +/-   ##
========================================
  Coverage    80.69%   80.69%           
========================================
  Files           50       50           
  Lines         2673     2673           
========================================
  Hits          2157     2157           
  Misses         516      516           

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