fix(examples): update live-preview example to ESM (#12570)

Partial fix for #12551.

The Live Preview example was unable to boot because it was running
CommonJS instead of ESM.

Author: jacobsfletch

examples/live-preview/next-env.d.ts

@@ -2,4 +2,4 @@
 /// <reference types="next/image-types/global" />
 
 // NOTE: This file should not be edited
-// see https://nextjs.org/docs/app/building-your-application/configuring/typescript for more information.
+// see https://nextjs.org/docs/app/api-reference/config/typescript for more information.

examples/live-preview/package.json

@@ -3,6 +3,7 @@
   "version": "1.0.0",
   "description": "Payload Live Preview example.",
   "license": "MIT",
+  "type": "module",
   "main": "dist/server.js",
   "scripts": {
     "build": "cross-env NODE_OPTIONS=--no-deprecation next build",