CompatHelper: bump compat for StructArrays to 0.6, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the StructArrays package from 0.4.1 to 0.4.1, 0.6.
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 lines are covered by tests ✅

Comparison is base (f83f0c7) 87.60% compared to head (23b4fd2) 82.69%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #302      +/-   ##
==========================================
- Coverage   87.60%   82.69%   -4.92%     
==========================================
  Files          15       15              
  Lines        1759     1277     -482     
==========================================
- Hits         1541     1056     -485     
- Misses        218      221       +3     

see 15 files with indirect coverage changes

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