[examples] Bump Next.js to 11.1.0 (#6582)

examples/nextjs/pages/api/hello.js

@@ -1,6 +1,5 @@
 // Next.js API route support: https://nextjs.org/docs/api-routes/introduction
 
-export default (req, res) => {
-  res.statusCode = 200
-  res.json({ name: 'John Doe' })
+export default function handler(req, res) {
+  res.status(200).json({ name: 'John Doe' })
 }