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

[github-actions]

This pull request changes the compat entry for the EasyFit package from 0.6.8 to 0.6.8, 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 89.14%. Comparing base (52cf9cc) to head (648410f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #70   +/-   ##
=======================================
  Coverage   89.14%   89.14%           
=======================================
  Files          40       40           
  Lines        1483     1483           
=======================================
  Hits         1322     1322           
  Misses        161      161           

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