CompatHelper: bump compat for JLArrays to 0.3 for package test, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the JLArrays package from 0.2 to 0.2, 0.3 for package test.
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 72.17%. Comparing base (06871fd) to head (24aee78).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #11   +/-   ##
=======================================
  Coverage   72.17%   72.17%           
=======================================
  Files           3        3           
  Lines         248      248           
=======================================
  Hits          179      179           
  Misses         69       69           

Flag	Coverage Δ
docs	0.00% <ø> (ø)

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