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 0.4, 0.5, 0.6 to 0.4, 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 56.38%. Comparing base (c67ed01) to head (35ed3bd).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
+ Coverage   52.72%   56.38%   +3.66%     
==========================================
  Files           6        6              
  Lines         753      752       -1     
==========================================
+ Hits          397      424      +27     
+ Misses        356      328      -28     

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[fhagemann]

@oschulz This should be good to go.