fix: add since param for activity manager

Signed-off-by: Anna Larch <anna@nextcloud.com>

lib/public/Activity/IManager.php

@@ -134,6 +134,7 @@ interface IManager {
 	 * @param string $type
 	 * @param int|numeric-string $id
 	 * @since 8.2.0
+	 * @since 33.0.0 $id can also be a string
 	 */
 	public function setFormattingObject(string $type, int|string $id): void;