Use Node 16 in chromaui/action

[IanVS]

Feature request

I'm getting a deprecation warning in Github from the chromatic github action, since it's apparently using node 12:

Node.js 12 actions are deprecated. For more information see: https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/. Please update the following actions to use Node.js 16: chromaui/action

Proposed solution

Update to node 16.