frigate-hass-card: Event fetching does not work with bleeding edge HA 2022.3

Get this error on new betas: Received invalid response from Home Assistant for request: {"type":"media_source/browse_media","media_content_id":"media-source://frigate/frigate/event-search/snapshots////cesta//","id":56}. Invalid keys: 'children'. [Check troubleshooting](https://github.com/dermotduffy/frigate-hass-card#troubleshooting).