Update ingress-nginx chart to 3.21.0

flux/oas/ingress.yaml

@@ -9,9 +9,10 @@ metadata:
 spec:
   releaseName: ingress
   chart:
+    # https://artifacthub.io/packages/helm/ingress-nginx/ingress-nginx
     repository: https://kubernetes.github.io/ingress-nginx
     name: ingress-nginx
-    version: 2.15.0
+    version: 3.21.0
   valuesFrom:
     - secretKeyRef:
         name: ingress-settings