Update boilerplate

When doing the pong tutorial, I used the boilerplate. Certain Game.js imports like KeyboardControls were missing on this version, and seemed to be fixed when I upgraded to 4.0.9. This should be updated so it works smoothly with the main tutorial. 

https://github.com/lance-gg/tinygames/blob/e613b19036ea91e4beef338279c48c9e076bdda6/boilerplate/package.json#L13