Chore: use actions/setup-node@v2 in CI

[snitin315]

CI-related change.

updated setup-node action to v2 for CI node workflow.

https://github.com/marketplace/actions/setup-node-js-environment

[btmills]

Neat, thanks! LGTM as-is, but since this version supports caching, do you have any interest in enabling that too?

[snitin315]

I think we need a package-lock.json to enable caching, and the repository doesn't have one. There was a similar attempt in eslint repo for this in eslint/eslint#14843

[btmills]

I think we need a package-lock.json to enable caching, and the repository doesn't have one.

Ah, never mind then.