Manually update k8s.io packages to k8s 1.21 api v0.21.0 (#4567)

go.mod

@@ -14,7 +14,6 @@ require (
 	github.com/dustin/go-humanize v1.0.0 // indirect
 	github.com/farsightsec/golang-framestream v0.3.0
 	github.com/golang/protobuf v1.4.3
-	github.com/gorilla/websocket v1.4.0 // indirect
 	github.com/grpc-ecosystem/grpc-opentracing v0.0.0-20180507213350-8e809c8a8645
 	github.com/hashicorp/golang-lru v0.5.4 // indirect
 	github.com/imdario/mergo v0.3.9 // indirect
@@ -30,13 +29,13 @@ require (
 	github.com/prometheus/common v0.15.0
 	go.etcd.io/etcd v0.5.0-alpha.5.0.20200306183522-221f0cc107cb
 	go.uber.org/zap v1.14.1 // indirect
-	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad
-	golang.org/x/sys v0.0.0-20201214210602-f9fddec55a1e
+	golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83
+	golang.org/x/sys v0.0.0-20210225134936-a50acf3fe073
 	google.golang.org/api v0.29.0
 	google.golang.org/grpc v1.29.1
 	gopkg.in/DataDog/dd-trace-go.v1 v1.28.0
-	k8s.io/api v0.20.2
-	k8s.io/apimachinery v0.20.2
-	k8s.io/client-go v0.20.2
+	k8s.io/api v0.21.0
+	k8s.io/apimachinery v0.21.0
+	k8s.io/client-go v0.21.0
 	k8s.io/klog v1.0.0
 )