Update Helm release ingress-nginx to v4.15.0

Author: renovate[bot]

infra/argo-apps/ingress-nginx.yaml

@@ -11,7 +11,7 @@ spec:
         valueFiles:
           - $myRepo/infra/ingress-nginx/values.yaml
       repoURL: https://kubernetes.github.io/ingress-nginx
-      targetRevision: 4.14.1
+      targetRevision: 4.15.0
     - repoURL: https://github.com/code4romania/code4ro-k8s.git
       targetRevision: HEAD
       ref: myRepo