CompatHelper: bump compat for "OrdinaryDiffEq" to "6.16"

[github-actions[bot]]

This pull request changes the compat entry for the OrdinaryDiffEq package from 5.41.0 to 5.41.0, 6.16.

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.