ts: Update engines.node to >= 17

[acheroncrypto]

Problem

@coral-xyz/anchor library's node version requirement is not specific enough:

anchor/ts/packages/anchor/package.json

Line 22 in 6eb4cc7

"node": ">=11"

This is because of using structuredClone internally, which requires node >= 17 (see compatibility).

Users may run into this problem if they use an outdated node version, e.g. #2969.

Summary of changes

Update engines.node field of package.json to >= 17.

[vercel]

@acheroncrypto is attempting to deploy a commit to the coral-xyz Team on Vercel.

A member of the Team first needs to authorize it.