Add contatinerd 2.3 support

[a-mccarthy]

once validated, add containerd 2.3 support.

Note that this introduces config v4.0 support in containerd

Also update the CDI note to include 2.3+, https://docs.nvidia.com/datacenter/cloud-native/gpu-operator/latest/cdi.html, https://docs.nvidia.com/datacenter/cloud-native/gpu-operator/latest/getting-started.html, and the note on the supported platform