CompatHelper: bump compat for Optimization to 4, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the Optimization package from 3.16.0 to 3.16.0, 4.
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 83.52%. Comparing base (02989d0) to head (1c58841).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #209   +/-   ##
=======================================
  Coverage   83.52%   83.52%           
=======================================
  Files          13       13           
  Lines         601      601           
=======================================
  Hits          502      502           
  Misses         99       99           

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