CompatHelper: bump compat for DataInterpolations to 8, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the DataInterpolations package from 7 to 7, 8.
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-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.76%. Comparing base (b2975bd) to head (32e04dd).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #17   +/-   ##
=======================================
  Coverage   61.76%   61.76%           
=======================================
  Files           4        4           
  Lines         170      170           
=======================================
  Hits          105      105           
  Misses         65       65           

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