Freshen lockfile to expose preset-env breakage

This gets us on the relevant latest versions of *all* of our
dependencies, transitive and otherwise, including the latest versions of
`@babel/preset-env` and `ember-cli`, which together trigger the build
error seen in #204 and emberjs/ember-cli-babel#419.

**This commit fails intentionally.** The follow-on commit will fix it,
and the CI history will thereby act equivalent to a fixed failing test.

Author: chriskrycho