What does this PR do?
Remove several dependencies that are no longer used directly by this module.
What testing has been done on this change?
All tests passed locally
I think the test failures are unrelated. https://github.com/apache/cordova-coho/blob/master/docs/tools-release-process.md#update-and-pin-dependencies does have a note about not updating elementtree to 0.16, but it seems like we already had it that version so maybe that problem is gone now?