CompatHelper: bump compat for Trixi to 0.14 for package test, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the Trixi package from 0.11.12, 0.12, 0.13 to 0.11.12, 0.12, 0.13, 0.14 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 96.11%. Comparing base (3ed99f5) to head (07730a1).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #270   +/-   ##
=======================================
  Coverage   96.11%   96.11%           
=======================================
  Files          25       25           
  Lines        1260     1260           
  Branches       74       74           
=======================================
  Hits         1211     1211           
  Misses         45       45           
  Partials        4        4           

Flag	Coverage Δ
unittests	96.11% <ø> (ø)

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