Node requirement is set to 12. Needs an update

[vbuch]

Just noticed we have Node 12 in package.json. Thought of introducing linting in packages/examples and needed to figure out the ES spec that is covered by Node 12. That would be ES2019. This is quite a while back. I've set it but I think it needs updating. Then went into GH Actions and here is what it reported:

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v2, actions/setup-node@v2, coverallsapp/github-action@master. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions/setup-node@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/