Node deprecations for Github actions

[rtblair]

I noticed running our Publish Github workflow that some of the dependent actions are pegged to deprecated and unsupported versions of Node (12, specifically). The actions continue to run successfully, so I suppose this isn't yet an urgent issue. But Node 16, the current environment being used for running all actions, will go EOL later this year and we might not be as lucky when they move to the next release.

I suggest rebuilding these flows using updated versions of actions. For this workflow in particular, it might be as simple as using a newer version of actions/checkout. We're currently on v2, and the latest release is 3.5.2

https://github.com/NYCPlanning/ceqr-app-data/blob/main/.github/workflows/publish.yml#L39
https://github.com/actions/checkout/releases

[Vena-zamismo-no]

17#'s