Version 3.11.3+ and 3.12 change the way subprocess with shell=True
works to no longer use the PATH but instead rely on %ComSpec% or
%SystemRoot% which are currently not present in the cerbero env.
51b079a2d6
Pin to 3.11.2 until we fix cerbero.
https://gitlab.freedesktop.org/gstreamer/cerbero/-/issues/427
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4468>