fix(dx): corrected annotation of OpenApi\Model\Operation::addResponse()

Key can be status code `200`, etc as well.

Author: petski

src/OpenApi/Model/Operation.php

@@ -26,10 +26,7 @@ public function __construct(private ?string $operationId = null, private ?array
         $this->extensionProperties = $extensionProperties;
     }
 
-    /**
-     * @param string $status
-     */
-    public function addResponse(Response $response, $status = 'default'): self
+    public function addResponse(Response $response, int|string $status = 'default'): self
     {
         $this->responses[$status] = $response;