pkg/asset: bump checkpoint image
pkg/asset: bump checkpoint image

diegs/bootkube,kubernetes-incubator/bootkube,ericchiang/bootkube,ericchiang/bootkube,kubernetes-incubator/bootkube,dghubble/bootkube,dghubble/bootkube,diegs/bootkube,hongchaodeng/bootkube,dghubble/bootkube,kubernetes-incubator/bootkube,diegs/bootkube,hongchaodeng/bootkube,ericchiang/bootkube,hongchaodeng/bootkube