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 0.2, 0.3, 0.4 to 0.2, 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 91.54%. Comparing base (3204f6c) to head (766938c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #96   +/-   ##
=======================================
  Coverage   91.54%   91.54%           
=======================================
  Files          10       10           
  Lines         627      627           
=======================================
  Hits          574      574           
  Misses         53       53           

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