Outdated transitive dependency on continuation-local-storage leads to warnings

[oleg-codaio]

When using PM2 on Node v12, I'm seeing the following warnings:

DeprecationWarning: Socket.prototype._handle is deprecated

This is coming from the opencensus/@core package, which uses continuation-local-storage. I've opened an issue there (census-instrumentation/opencensus-node#792) to track migrating to cls-hooked, and after that's done, the dependency should be updated here as well.