Update actions to use Node.js 16

[assignUser]

Github has started deprecation of node.js 12 for actions due to it's EOL in Aprill '22:

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: r-lib/actions

I would offer a PR but I am unfamiliar with node actions and how to test them, as I am guessing it is more than updating using: 'node12' to using: 'node16'?

[gaborcsardi]

Why is this a bug? Are the builds already failing?

[assignUser]

No, currently there is just the warning I posted above displayed on each job using node12 actions (though brownouts will probably happen at some point so I wanted to raise this issue after noticing the warning on our builds).

I didn't use the "feature" template as this is not really adding anything new but please re-label to your preference.

[gaborcsardi]

This is now done in @v2-branch, to be released soon.

[github-actions[bot]]

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