fix(files_sharing): Fix share expiry notification rich message

Signed-off-by: provokateurin <[email protected]>

apps/files_sharing/lib/Notification/Notifier.php

@@ -126,9 +126,9 @@ protected function parseShareExpiration(IShare $share, INotification $notificati
 				[
 					'node' => [
 						'type' => 'file',
-						'id' => $node->getId(),
+						'id' => (string)$node->getId(),
 						'name' => $node->getName(),
-						'path' => $path,
+						'path' => (string)$path,
 					],
 				]
 			);