Release new helm chart with certgen fixed (#7478)

* Update go version, modules and remove ioutil

* Release new helm chart with certgen fixed

charts/ingress-nginx/Chart.yaml

@@ -2,8 +2,8 @@ apiVersion: v2
 name: ingress-nginx
 # When the version is modified, make sure the artifacthub.io/changes list is updated
 # Also update CHANGELOG.md
-version: 4.0.0
-appVersion: 1.0.0-beta.1
+version: 4.0.0-beta.2
+appVersion: 1.0.0-beta.2
 home: https://github.com/kubernetes/ingress-nginx
 description: Ingress controller for Kubernetes using NGINX as a reverse proxy and load balancer
 icon: https://upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Nginx_logo.svg/500px-Nginx_logo.svg.png
@@ -25,3 +25,4 @@ annotations:
   # https://artifacthub.io/packages/helm/ingress-nginx/ingress-nginx?modal=changelog
   artifacthub.io/changes: |
     - Drop support for extensions/v1beta1, networking.k8s.io/v1beta1
+    - Change webhook-certgen to use internal image