Merge pull request #1530 from h3mmy/renovate/k8s-gateway-1.1.x

fix: update helm chart k8s-gateway to 1.1.15

Author: h3mmy

cluster/apps/networking/k8s-gateway/helm-release.yaml

@@ -9,7 +9,7 @@ spec:
   chart:
     spec:
       chart: k8s-gateway
-      version: 1.1.14
+      version: 1.1.15
       sourceRef:
         kind: HelmRepository
         name: k8s-gateway