Return response from named limiter (#34325)

If a named limiter returns a Response object, the `handleRequestUsingNamedLimiter` tried to return the unset variable `$limit`.

Instead, it should return the actual response created by the named limiter.

src/Illuminate/Routing/Middleware/ThrottleRequests.php

@@ -85,7 +85,7 @@ protected function handleRequestUsingNamedLimiter($request, Closure $next, $limi
         $limiterResponse = call_user_func($limiter, $request);
 
         if ($limiterResponse instanceof Response) {
-            return $limit;
+            return $limiterResponse;
         } elseif ($limiterResponse instanceof Unlimited) {
             return $next($request);
         }