use new notification update feature

[szaimen]

See https://github.com/nextcloud/notifications/pull/2020/files#diff-8ed2619991987ffe33630e0f3af607f3ca23cbfb81a0c1669fa087a2d186bc75

Maybe do this in 2 steps:

• use --object-type='update' --object-id='libx' to update the notification if it was not dismissed yet notify-scripts: add object type and object id #5554
• Specify the --output-id-only option and store it to later be able to delete it again