docs(contributing): change node version

[kuang-lingxi]

I noticed that optional operator(?.) is used in scripts/dev, but it only supports node 14+, so should node 14 be the minimum version limit for developers?

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[Justineo]

It's actually declared as:

core/package.json

Lines 46 to 48 in 1574edd

	"engines": {
	"node": ">=16.5.0"
	},

[kuang-lingxi]

Sorry I just noticed this. I just followed the docs before. Wouldn't it be better if the docs could be updated synchronously?

maybe a new pr is clearer. 5422