CompatHelper: bump compat for StructArrays to 0.7, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the StructArrays package from 0.5, 0.6 to 0.5, 0.6, 0.7.
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 39.05%. Comparing base (3c0c0c6) to head (5d59e6f).
Report is 25 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #76   +/-   ##
=======================================
  Coverage   39.05%   39.05%           
=======================================
  Files          27       27           
  Lines        1987     1987           
=======================================
  Hits          776      776           
  Misses       1211     1211           

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[fhagemann]

Closing this, as this was already done in #79