ffmpeg.recipe: Update to 4.1.1
ffmpeg.recipe: Update to 4.1.1

To match the update in gst-libav

https://gitlab.freedesktop.org/gstreamer/gst-libav/merge_requests/10

fluendo/cerbero,nirbheek/cerbero,fluendo/cerbero,fluendo/cerbero,atsushieno/cerbero,atsushieno/cerbero,fluendo/cerbero,GStreamer/cerbero,GStreamer/cerbero,atsushieno/cerbero,nirbheek/cerbero,GStreamer/cerbero,nirbheek/cerbero,atsushieno/cerbero,nirbheek/cerbero,GStreamer/cerbero,atsushieno/cerbero,fluendo/cerbero,GStreamer/cerbero