Update dependency k8s.gcr.io/ingress-nginx/kube-webhook-certgen to v1.2.0

This MR contains the following updates:

Package	Type	Update	Change
k8s.gcr.io/ingress-nginx/kube-webhook-certgen	ironbank-docker	minor	v1.1.1 -> v1.2.0
k8s.gcr.io/ingress-nginx/kube-webhook-certgen	stage	minor	v1.1.1 -> v1.2.0

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