fix(templates): vercel website migrations (#9235)

Properly generate migrations for with-vercel-website template

Author: denolfe

templates/with-vercel-postgres/pnpm-lock.yaml

@@ -32,7 +32,7 @@ export default buildConfig({
   plugins: [
     vercelBlobStorage({
       collections: {
-        slug: true,
+        media: true,
       },
       token: process.env.BLOB_READ_WRITE_TOKEN || '',
     }),