Update PublicAlbumAuthBackend licence to 3.0 or later

Signed-off-by: Louis Chemineau <louis@chmn.me>

lib/Sabre/PublicAlbumAuthBackend.php

@@ -1,7 +1,7 @@
 <?php
 /**
  * SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
- * SPDX-License-Identifier: AGPL-3.0-only
+ * SPDX-License-Identifier: AGPL-3.0-or-later
  */
 namespace OCA\Photos\Sabre;