cerbero: Retry if cargo update fails on macOS
Missed spurious error from #389 (closed)
https://gitlab.freedesktop.org/gstreamer/cerbero/-/jobs/35444175
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
Missed spurious error from #389 (closed)
https://gitlab.freedesktop.org/gstreamer/cerbero/-/jobs/35444175