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

[github-actions]

This pull request changes the compat entry for the Optim package from 1.13 to 1.13, 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 76.43%. Comparing base (065ae17) to head (9f8be8a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
- Coverage   78.77%   76.43%   -2.34%     
==========================================
  Files          13       13              
  Lines         556      556              
==========================================
- Hits          438      425      -13     
- Misses        118      131      +13     

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