fix: update geolocation examples to next 15 (#973)

### Description

Since we're using canary, the current geolocation examples are broken.
This PR updates the geolocation examples since `NextRequest.geo` was
removed in Next 15.

I opted to use the `@vercel/functions` package as recommended in the
[Upgrade
guide](https://nextjs.org/docs/app/building-your-application/upgrading/version-15#nextrequest-geolocation),
however we could always refactor to using the raw headers.

### Type of Change

- [x] Example updates (Bug fixes, new features, etc.)

edge-middleware/geolocation-country-block/README.md

@@ -5,13 +5,14 @@ marketplace: false
 # Geolocation Country Block
 
 ```ts
+import { geolocation } from '@vercel/functions'
 import type { NextRequest } from 'next/server'
 
 // Block Austria, prefer Germany
 const BLOCKED_COUNTRY = 'AT'
 
 export default function middleware(req: NextRequest) {
-  const country = req.geo.country || 'US'
+  const country = geolocation(req).country || 'US'
 
   if (country === BLOCKED_COUNTRY) {
     return new Response('Blocked for legal reasons', { status: 451 })

edge-middleware/geolocation-country-block/middleware.ts

@@ -1,5 +1,5 @@
+import { geolocation } from '@vercel/functions'
 import type { NextRequest } from 'next/server'
-
 import { NextResponse } from 'next/server'
 
 // Block Austria, prefer Germany
@@ -11,8 +11,9 @@ export const config = {
 }
 
 export default function middleware(req: NextRequest) {
+  const geo = geolocation(req)
   // Extract country
-  const country = req.geo.country || 'US'
+  const country = geo.country || 'US'
 
   // Specify the correct pathname
   if (country === BLOCKED_COUNTRY) {

edge-middleware/geolocation-country-block/package.json

@@ -10,6 +10,7 @@
     "lint": "next lint"
   },
   "dependencies": {
+    "@vercel/functions": "^1.5.0",
     "next": "canary",
     "react": "latest",
     "react-dom": "latest"