Updated Twig cache directory name

The cache directory name for the Twig environment has been updated. The previous hyphen-separated name 'twig-cache' has been replaced with an underscore-separated one, 'twig_cache'. This change ensures consistency in naming conventions across the project.

script.php

@@ -122,7 +122,7 @@ if(php_sapi_name() == 'cli' || $_SERVER["REQUEST_URI"] == '/metrics') {
 
     $loader = new \Twig\Loader\FilesystemLoader('templates');
     $twig = new \Twig\Environment($loader, [
-        'cache' => 'twig-cache',
+        'cache' => 'twig_cache',
     ]);
     echo $twig->render('metrics.twig', ['config' => $config]);
 }