Update github.com/coreos/go-systemd/v22 to v22.4.0 which introduces
`GetUnitNameByPID`. This function will be used in node e2e to get the
container runtime systemd unit name.
Performed by:
$ hack/pin-dependency.sh github.com/coreos/go-systemd/v22 v22.4.0
$ hack/update-vendor.sh
Signed-off-by: David Porter <david@porter.me>