fix: upgrade ovsx from 0.2.1 to 0.3.0 (#240)

The new version of `ovsx` has a looser dependency on `vsce` which will allow a single version of `vsce` to be used across this package. This helps to reduce the number of dependencies as well as addresses some security vulnerabilities.

And also refresh the lock file as well as upgrade `npm` used as well.

Refs eclipse/openvsx#403

Author: felipecrs