CompatHelper: bump compat for Trixi to 0.11 for package test, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the Trixi package from 0.9.12, 0.10 to 0.9.12, 0.10, 0.11 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 95.62%. Comparing base (5fbb61e) to head (3c912b0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #230   +/-   ##
=======================================
  Coverage   95.62%   95.62%           
=======================================
  Files          23       23           
  Lines        1097     1097           
  Branches       63       63           
=======================================
  Hits         1049     1049           
  Misses         44       44           
  Partials        4        4           

Flag	Coverage Δ
unittests	95.62% <ø> (ø)

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