Update Node.js from v12 to v16

[yykamei]

According to the release policy of Node.js,
Node.js v12 reached EOL (end-of-life).

https://nodejs.org/en/about/releases/

I think ruby/setup-ruby is ready to update Node.js to v16
because GitHub Actions runners support v16.

actions/runner#772

[eregon]

Thanks!

[chenrui333]

I am a bit surprised that this did not come as a major release (there are incompatibility with this change) Any thoughts?

[eregon]

IMHO it's too much to ask every user to bump a major version just for a dependency (node) which is anyway provided by the GitHub Actions runner software/its dependencies: #302 (comment)
I don't think it's reasonable to expect to be able to run recent actions with an old runner, is it?

[MSP-Greg]

Note that the Ubuntu-22.04 image only has node 14 & 16 installed.

[ShockwaveNN]

Note that the Ubuntu-22.04 image only has node 14 & 16 installed.

I've taken a look and Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, all macOS and latest Windows images have nodejs v16 installed by default according to README

So not sure about that incompatibility @chenrui333 talking about?