Pin live-server dependencies that are marked as "latest"

[bmuenzenmeyer]

This is a poor practice and leads to a recoverable but ugly error during publish and some other commands

https://github.com/pattern-lab/patternlab-node/blob/master/packages/live-server/package.json#L14-L28

Replace this with the actual latest value that is resolved from the following command:

npm view <<pkg>> versions
example
npm view cors versions