Update deps to Kube 1.11.3

This updates the dependencies to Kube 1.11.3 to pull in a fix allowing
requestheader auth to be used without normal client auth (which makes
things work on clusters that don't enable client auth normally, like
EKS).

vendor/k8s.io/apiserver/plugin/pkg/audit/buffered/buffered.go

@@ -102,6 +102,7 @@ type bufferedBackend struct {
 var _ audit.Backend = &bufferedBackend{}
 
 // NewBackend returns a buffered audit backend that wraps delegate backend.
+// Buffered backend automatically runs and shuts down the delegate backend.
 func NewBackend(delegate audit.Backend, config BatchConfig) audit.Backend {
 	var throttle flowcontrol.RateLimiter
 	if config.ThrottleEnable {