multimedia/emby-server: update to 4.8.6.0
Changes: https://github.com/MediaBrowser/Emby.Releases/releases/tag/4.8.4.0
Changes: https://github.com/MediaBrowser/Emby.Releases/releases/tag/4.8.5.0
Changes: https://github.com/MediaBrowser/Emby.Releases/releases/tag/4.8.6.0