build(deps): bump k8s.io/client-go from 0.18.8 to 0.19.0 (#4095)

Bumps [k8s.io/client-go](https://github.com/kubernetes/client-go) from 0.18.8 to 0.19.0.
- [Release notes](https://github.com/kubernetes/client-go/releases)
- [Changelog](https://github.com/kubernetes/client-go/blob/master/CHANGELOG.md)
- [Commits](https://github.com/kubernetes/client-go/compare/v0.18.8...v0.19.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

go.mod

@@ -20,7 +20,7 @@ require (
 	github.com/hashicorp/golang-lru v0.5.4 // indirect
 	github.com/imdario/mergo v0.3.9 // indirect
 	github.com/infobloxopen/go-trees v0.0.0-20190313150506-2af4e13f9062
-	github.com/kr/pretty v0.2.0 // indirect
+	github.com/jessevdk/go-flags v1.4.0 // indirect
 	github.com/matttproud/golang_protobuf_extensions v1.0.1
 	github.com/miekg/dns v1.1.31
 	github.com/opentracing-contrib/go-observer v0.0.0-20170622124052-a52f23424492 // indirect
@@ -33,12 +33,13 @@ require (
 	go.etcd.io/etcd v0.5.0-alpha.5.0.20200306183522-221f0cc107cb
 	go.uber.org/zap v1.14.1 // indirect
 	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
-	golang.org/x/sys v0.0.0-20200615200032-f1bc736245b1
+	golang.org/x/sys v0.0.0-20200622214017-ed371f2e16b4
 	google.golang.org/api v0.29.0
 	google.golang.org/grpc v1.29.1
 	gopkg.in/DataDog/dd-trace-go.v1 v1.26.0
-	k8s.io/api v0.18.8
-	k8s.io/apimachinery v0.18.8
-	k8s.io/client-go v0.18.8
+	k8s.io/api v0.19.0
+	k8s.io/apimachinery v0.19.0
+	k8s.io/client-go v0.19.0
 	k8s.io/klog v1.0.0
+	sigs.k8s.io/structured-merge-diff/v3 v3.0.0 // indirect
 )