CompatHelper: bump compat for KernelAbstractions to 0.8, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the KernelAbstractions package from 0.7 to 0.7, 0.8.
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]

Codecov Report

Merging #96 (174f088) into master (6991d24) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #96   +/-   ##
=======================================
  Coverage   41.90%   41.90%           
=======================================
  Files           9        9           
  Lines         420      420           
=======================================
  Hits          176      176           
  Misses        244      244           

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