opus.recipe: Update to 1.3
opus.recipe: Update to 1.3

https://people.xiph.org/~jm/opus/opus-1.3/

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