CompatHelper: bump compat for Optimization in [weakdeps] to 5, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the Optimization package from 4 to 4, 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 85.37%. Comparing base (830a25c) to head (1ec58a1).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #101   +/-   ##
=======================================
  Coverage   85.37%   85.37%           
=======================================
  Files           8        8           
  Lines         335      335           
=======================================
  Hits          286      286           
  Misses         49       49           

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