Update action-setup-node.md

[seungwoncode]

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Why:

issues: #31846

setup-node most recent published version is v4.

https://github.com/actions/setup-node

Closes:

What's being changed (if available, include any code snippets, screenshots, or gifs):

Check off the following:

• [ ] I have reviewed my changes in staging, available via the View deployment link in this PR's timeline (this link will be available after opening the PR).

  • For content changes, you will also see an automatically generated comment with links directly to pages you've modified. The comment won't appear if your PR only edits files in the data directory.

• [ ] For content changes, I have completed the self-review checklist.

[welcome[bot]]

Thanks for opening this pull request! A GitHub docs team member should be by to give feedback soon. In the meantime, please check out the contributing guidelines.

[nguyenalex836]

@seungwonleee Thanks so much for opening a PR! I'll get this triaged for review ✨

[github-actions[bot]]

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