CompatHelper: bump compat for CTBase to 0.16 for package docs, (drop existing compat)

[github-actions[bot]]

This pull request changes the compat entry for the CTBase package from 0.15 to 0.16 for package docs. This drops 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.