Update k8s dependency version to 1.21

Signed-off-by: xinyanwu409 <wxinyan@vmware>

vendor/k8s.io/client-go/tools/leaderelection/resourcelock/interface.go

@@ -145,10 +145,13 @@ func New(lockType string, ns string, name string, coreClient corev1.CoreV1Interf
 }
 
 // NewFromKubeconfig will create a lock of a given type according to the input parameters.
+// Timeout set for a client used to contact to Kubernetes should be lower than
+// RenewDeadline to keep a single hung request from forcing a leader loss.
+// Setting it to max(time.Second, RenewDeadline/2) as a reasonable heuristic.
 func NewFromKubeconfig(lockType string, ns string, name string, rlc ResourceLockConfig, kubeconfig *restclient.Config, renewDeadline time.Duration) (Interface, error) {
 	// shallow copy, do not modify the kubeconfig
 	config := *kubeconfig
-	timeout := ((renewDeadline / time.Millisecond) / 2) * time.Millisecond
+	timeout := renewDeadline / 2
 	if timeout < time.Second {
 		timeout = time.Second
 	}