CompatHelper: bump compat for Functors to 0.5, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the Functors package from 0.4 to 0.4, 0.5.
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 94.49%. Comparing base (93c16a5) to head (fee0115).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #110   +/-   ##
=======================================
  Coverage   94.49%   94.49%           
=======================================
  Files          14       14           
  Lines        1380     1380           
=======================================
  Hits         1304     1304           
  Misses         76       76           

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