ci: use electronjs/node orb

[dsanders11]

Greatly simplifies the config by using electronjs/node. IMO it's better to use electronjs/node here instead of pinning to a specific cimg/node since I don't know how long those tags receive security updates for, while electronjs/node installs Node.js on top of cimg/base.

[juliangruber]

Is it time to switch to GitHub Actions, for simplicity?

[dsanders11]

Is it time to switch to GitHub Actions, for simplicity?

In this specific case not sure we gain much from switching it just because we use CircleCI (and the electronjs/node orb) across the rest of our Ecosystem WG repos (since many of them need CircleCI for our CFA implementation), so it's nice to be consistent. But yes, this would be straightforward to switch to GitHub Actions.