CI: revert npm publish step to node 14 (#3234)
CI: revert npm publish step to node 14 (#3234)

Summary:
The experimental publish steps have been failing with an error like this:
```
npm ERR! code 128
npm ERR! command failed
npm ERR! command /usr/bin/git ls-remote ssh://git@github.com/dist/babel-plugin-relay.git
npm ERR! Warning: Permanently added the RSA host key for IP address '140.82.114.4' to the list of known hosts.
npm ERR! git@github.com: Permission denied (publickey).
npm ERR! fatal: Could not read from remote repository.
npm ERR!
npm ERR! Please make sure you have the correct access rights
npm ERR! and the repository exists.
```

This seems to have started when I upgraded CI to node 15, which I think comes with a new `npm` version as well. Haven't dug into if this is a regression or something we need to update yet.

For now just revert to the stable release.

Pull Request resolved: https://github.com/facebook/relay/pull/3234

Reviewed By: jstejada

Differential Revision: D24557542

Pulled By: kassens

fbshipit-source-id: 1fa61942316237cbf9929763a0c229626c886cd1

atxwebs/relay,kassens/relay,yungsters/relay,xuorig/relay,xuorig/relay,wincent/relay,wincent/relay,voideanvalue/relay,xuorig/relay,facebook/relay,wincent/relay,josephsavona/relay,voideanvalue/relay,yungsters/relay,wincent/relay,facebook/relay,facebook/relay,atxwebs/relay,josephsavona/relay,facebook/relay,atxwebs/relay,yungsters/relay,xuorig/relay,voideanvalue/relay,facebook/relay,facebook/relay,voideanvalue/relay,atxwebs/relay,wincent/relay,wincent/relay,josephsavona/relay,kassens/relay,kassens/relay,voideanvalue/relay,kassens/relay,xuorig/relay,kassens/relay,kassens/relay,xuorig/relay,voideanvalue/relay