fix: drop curl_close() call (deprecated PHP 8.5, no-op since 8.0)

src/SystemController.php

@@ -446,7 +446,6 @@ class SystemController
         curl_exec($ch);
         $ms   = (int) round((microtime(true) - $start) * 1000);
         $code = (int) curl_getinfo($ch, CURLINFO_HTTP_CODE);
-        curl_close($ch);
         return $code > 0 ? [$code, $ms] : null;
     }
 }