Use `node:` prefixed in ESM emit of standalone server.js (#78624)
This enables running this directly in Deno, even when bare node builtin
imports are not enabled. By default Deno does not resolve bare node
builtins. You have to either prefix them with `node:`, or use
`--unstable-bare-node-builtins`
Co-authored-by: JJ Kasper <jj@jjsweb.site>