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 94.16%. Comparing base (1c1b90f) to head (243b86f).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
- Coverage   94.50%   94.16%   -0.34%     
==========================================
  Files          27       27              
  Lines        2073     2073              
==========================================
- Hits         1959     1952       -7     
- Misses        114      121       +7     

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