[Bug] handling of youtube scheduled videos

### Describe the bug

I follow a youtube channel that plans future live sessions. When it becomes a video, the id remains the same yt:video:XXXX but on FreshRSS the published date does not get updated with the new one.

Furthermore, if I mark as read a planned live session, when it becomes a video it does not show up again.

### To Reproduce

Subscribe to a channel with planned live sessions

### Expected behavior

_No response_

### FreshRSS version

1.27.1

### System information

N/A

### Additional context

_No response_