Merge branch 'renovate/ingress-nginx-4.x' into 'main'

Update Helm release ingress-nginx to v4.0.15

See merge request stackspin/stackspin!748

flux2/core/base/nginx/release.yaml

@@ -10,7 +10,7 @@ spec:
       # https://artifacthub.io/packages/helm/ingress-nginx/ingress-nginx
       # renovate: registryUrl=https://kubernetes.github.io/ingress-nginx
       chart: ingress-nginx
-      version: 4.0.13
+      version: 4.0.15
       sourceRef:
         kind: HelmRepository
         name: ingress-nginx