chore(deps): updated registry.k8s.io/ingress-nginx/kube-webhook-certgen docker tag to v1.6.4

Author: renovate[bot]

charts/eoapi/values.yaml

@@ -550,7 +550,7 @@ knative:
   # CloudEvents sink configuration (deployed when eoapi-notifier uses CloudEvents output)
   cloudEventsSink:
     enabled: false
-    image: registry.k8s.io/ingress-nginx/kube-webhook-certgen:v1.3.0
+    image: registry.k8s.io/ingress-nginx/kube-webhook-certgen:v1.6.4
     resources:
       requests:
         cpu: 50m