Regenerate storage client (#4589)

Generated in GitHub action: https://github.com/googleapis/googleapis/google-api-php-client-services/actions/workflows/codegen.yaml

src/Storage/Folder.php

@@ -31,10 +31,6 @@ class Folder extends \Google\Model
    * @var string
    */
   public $kind;
-  /**
-   * @var string[]
-   */
-  public $metadata;
   /**
    * @var string
    */
@@ -100,20 +96,6 @@ public function getKind()
   {
     return $this->kind;
   }
-  /**
-   * @param string[]
-   */
-  public function setMetadata($metadata)
-  {
-    $this->metadata = $metadata;
-  }
-  /**
-   * @return string[]
-   */
-  public function getMetadata()
-  {
-    return $this->metadata;
-  }
   /**
    * @param string
    */