Update ingress to use networking.k8s.io/v1 API

This enables the controller to run on Kubernetes v1.22, which has removed
ingress from extensions/v1beta1.

This updates the client-go library to v0.19.x, which introduced ingress to
networking/v1. Updating to v0.22.x is a more involved change as it requires
updates to a number of other dependencies.

go.mod

@@ -3,7 +3,7 @@ module sigs.k8s.io/external-dns
 go 1.16
 
 require (
-	cloud.google.com/go v0.50.0
+	cloud.google.com/go v0.51.0
 	git.blindage.org/21h/hcloud-dns v0.0.0-20200807003420-f768ffe03f8d
 	github.com/Azure/azure-sdk-for-go v45.1.0+incompatible
 	github.com/Azure/go-autorest/autorest v0.11.10
@@ -59,17 +59,16 @@ require (
 	go.uber.org/ratelimit v0.1.0
 	golang.org/x/net v0.0.0-20201224014010-6772e930b67b
 	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
-	golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208
-	golang.org/x/tools v0.0.0-20200708003708-134513de8882 // indirect
+	golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9
 	google.golang.org/api v0.15.0
 	gopkg.in/ns1/ns1-go.v2 v2.0.0-20190322154155-0dafb5275fd1
 	gopkg.in/yaml.v2 v2.3.0
 	honnef.co/go/tools v0.0.1-2020.1.4 // indirect
 	istio.io/api v0.0.0-20210128181506-0c4b8e54850f
 	istio.io/client-go v0.0.0-20210128182905-ee2edd059e02
-	k8s.io/api v0.18.8
-	k8s.io/apimachinery v0.18.8
-	k8s.io/client-go v0.18.8
+	k8s.io/api v0.19.14
+	k8s.io/apimachinery v0.19.14
+	k8s.io/client-go v0.19.14
 	k8s.io/kubernetes v1.13.0
 )