CompatHelper: bump compat for SciMLOperators to 0.4, (keep existing compat)

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This pull request changes the compat entry for the SciMLOperators package from <0.3.13 to <0.3.13, 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.