Bump containerd to v1.6.8-k3s1

Signed-off-by: Brad Davidson <brad.davidson@rancher.com>

scripts/version.sh

@@ -24,7 +24,7 @@ fi
 
 # We're building k3s against containerd 1.5 in go.mod because 1.6 has dependency
 # conflicts with Kubernetes, but we still need to bundle containerd 1.6.
-VERSION_CONTAINERD="v1.6.6-k3s1"
+VERSION_CONTAINERD="v1.6.8-k3s1"
 
 VERSION_CRICTL=$(grep github.com/kubernetes-sigs/cri-tools go.mod | head -n1 | awk '{print $4}')
 if [ -z "$VERSION_CRICTL" ]; then