Update min Node.js version to v16 (#48903)
Since Node.js v14 is [end of life this week](https://github.com/nodejs/Release) this updates our minimum supported Node.js version to v16.
x-ref: [slack thread](https://vercel.slack.com/archives/C04DUD7EB1B/p1681225776529319?thread_ts=1681202375.559349&cid=C04DUD7EB1B)
