refactor: use config() instead of new keyword

Author: kenjis

system/CodeIgniter.php

@@ -351,7 +351,7 @@ public function run(?RouteCollectionInterface $routes = null, bool $returnRespon
 
         // Check for a cached page. Execution will stop
         // if the page has been cached.
-        $cacheConfig = new Cache();
+        $cacheConfig = config(Cache::class);
         $response    = $this->displayCache($cacheConfig);
         if ($response instanceof ResponseInterface) {
             if ($returnResponse) {