CompatHelper: bump compat for IMASdd to 6, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the IMASdd package from 2, 3, 4, 5 to 2, 3, 4, 5, 6.
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 41.61%. Comparing base (55b5856) to head (405d27a).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #82   +/-   ##
=======================================
  Coverage   41.61%   41.61%           
=======================================
  Files           4        4           
  Lines         632      632           
=======================================
  Hits          263      263           
  Misses        369      369           

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