fix: change duplicated POST method to PUT method (#70308)

### What?

Non-static HTTP methods contain `PUT` method, but there are two `POST`
methods.

### How?

Change one `POST` method to `PUT` method

Co-authored-by: JJ Kasper <jj@jjsweb.site>

packages/next/src/server/route-modules/app-route/module.ts

@@ -693,7 +693,7 @@ export function hasNonStaticMethods(handlers: AppRouteHandlers): boolean {
   if (
     // Order these by how common they are to be used
     handlers.POST ||
-    handlers.POST ||
+    handlers.PUT ||
     handlers.DELETE ||
     handlers.PATCH ||
     handlers.OPTIONS