next: deadend 38.20230310.1.0

To work around coreos/fedora-coreos-tracker#1441,
we'll need to ship an F37-based barrier release that updates the
bootloader before updating to F38.  Newly-deployed nodes on 38.20230310.1.0
don't need to go through that barrier release, but our Cincinnati graph
builder would force it to do so anyway, causing a downgrade from F38 to
F37, and that isn't necessarily safe.  38.20230310.1.0 was never rolled
out and was only published for three days, so just deadend it, and roll
back stream metadata.

This effectively reverts b28f0f3.