CompatHelper: bump compat for Optim to 2, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the Optim package from 1.11 to 1.11, 2.
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 97.27%. Comparing base (de7acbb) to head (c9c6364).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #95   +/-   ##
=======================================
  Coverage   97.27%   97.27%           
=======================================
  Files          13       13           
  Lines        1029     1029           
=======================================
  Hits         1001     1001           
  Misses         28       28           

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