multimedia/elementary-videos: update to 3.0.0

ChangeLog: https://github.com/elementary/videos/releases/tag/3.0.0

 * Use playbin with the gst gtk widget for playback
 * Separate headerbars with deck pages
 * PlaylistItem: Some gtk4 preparations
 * Playlist: Preparations for GTK4
 * PlaylistPopover: send app notification when adding
 * LibraryItem: Simplifications and preparations for GTK4
 * LibraryPage: Preparations for GTK4
 * EpisodesPage: Preparations for GTK4
 * README: build with Flatpak
 * BottomBar and PlayerPage: GTK4 preparations
 * SettingsPopover: Preparations for GTK4
 * Window: put everything in a windowhandle
 * PlaybackManager: Improve position querying
 * Window: Some GTK4 preparations
 * PreviewPopover: Preparations for GTK4
 * Remove unused Clutter
 * Meson: use gnome.post_install to compile schemas
 * Metainfo: 3.0.0 release notes
 * Update screenshots
 * Meson: update to 3.0.0

PR:		273075
Reported by:	duchateau.olivier@gmail.com
Reviewed by: