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 0.3, 0.4 to 0.3, 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 70.27%. Comparing base (7ba4292) to head (879fbda).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
+ Coverage   68.84%   70.27%   +1.42%     
==========================================
  Files           4        3       -1     
  Lines         260      259       -1     
==========================================
+ Hits          179      182       +3     
+ Misses         81       77       -4     

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