nerdbox doesn't work on containerd 2.2.5 and containerd 2.3.x

may be we should this pr
https://github.com/containerd/containerd/commit/3c0e8a55b6e240045b0c80b46b93cf472e5aa738

use json.Unmarshal now it doesn't work now
```
func parseStartResponse(response []byte) (client.BootstrapParams, error) {
var params client.BootstrapParams

if err := json.Unmarshal(response, ¶ms); err != nil || params.Version < 2 {
// Use TTRPC for legacy shims
params.Address = string(response)
params.Protocol = "ttrpc"
params.Version = 2
}
```
@dmcgowan