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 0.6.11 to 0.6.11, 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 96.37%. Comparing base (9c2f326) to head (58e890a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2165   +/-   ##
=======================================
  Coverage   96.37%   96.37%           
=======================================
  Files         480      480           
  Lines       38178    38178           
=======================================
  Hits        36793    36793           
  Misses       1385     1385           

Flag	Coverage Δ
unittests	96.37% <ø> (ø)

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[sloede]

LGTM but it is not yet picked up in CI. What's our policy on how to proceed here, @ranocha?

[ranocha]

We have to wait until upstream packages update their dependencies so that we can test the new version here.