upgrade stargz to at least 0.16.0 to add support for containerd v2

This is why stargz is broken in 1.33 clusters as we are using containerd v2.1.1 here. As part of the release we want to move all clusters to using v2 so this important to resolve to ensure we do not break stargz in all of our stable templates. (ref: https://gitlab.cern.ch/kubernetes/automation/releases/kops-openstack/-/issues/109)

ref: https://github.com/containerd/stargz-snapshotter/releases/tag/v0.16.0

Support for containerd v2 ([#1722](https://github.com/containerd/stargz-snapshotter/pull/1722)), thanks to [@apostasie](https://github.com/apostasie)