CompatHelper: bump compat for Flux to 0.16, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the Flux package from 0.15.2 to 0.15.2, 0.16.
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 91.33%. Comparing base (72ca0e4) to head (c9ebb5a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #101   +/-   ##
=======================================
  Coverage   91.33%   91.33%           
=======================================
  Files          10       10           
  Lines         623      623           
=======================================
  Hits          569      569           
  Misses         54       54           

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