Update dependency kubernetes/ingress-nginx to v1.12.3 (#582)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

hack/config/ingress-nginx/default/kustomization.yaml

@@ -4,7 +4,7 @@ kind: Kustomization
 namespace: ingress-nginx
 
 resources:
-- https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.12.2/deploy/static/provider/cloud/deploy.yaml
+- https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.12.3/deploy/static/provider/cloud/deploy.yaml
 
 patches:
 - path: patch_default_ingress_class.yaml