Migrate from Node 12 to Node 14 / new LTS support

I am using Pattern Lab Node v5.16.2 on Mac, with Node v14.19.1, using a Vanilla Edition.

Expected Behavior

As mentioned within our Node Support policy we only support actively maintained versions of Node. That means that we're only supporting at minimum Node v14.19.1 (current version) from then on.

Actual Behavior

Currently we're still supporting Node 12, which could/needs to get switched to 14 at the end of April 2022.