orc.recipe: Bump to 0.4.31, switch to tarball
orc.recipe: Bump to 0.4.31, switch to tarball

We need to use this tarball for the 1.18 branch. We will switch back
to origin/master afterwards.

Part-of: <https://gitlab.freedesktop.org/gstreamer/cerbero/-/merge_requests/533>

GStreamer/cerbero,nirbheek/cerbero,GStreamer/cerbero,nirbheek/cerbero,GStreamer/cerbero,nirbheek/cerbero,GStreamer/cerbero,nirbheek/cerbero,GStreamer/cerbero