chore(deps): update helm release kiali-server to v2.21.0

Author: renovate[bot]

chapter_istio-ambient-mode/helm/helmfile.yaml

@@ -48,7 +48,7 @@ releases:
   namespace: istio-system
   createNamespace: true
   chart: kiali/kiali-server
-  version: 2.14.0
+  version: 2.21.0
   wait: true
   needs:
   - prometheus/kube-prometheus-stack

chapter_istio/helm/helmfile.yaml

@@ -33,6 +33,6 @@ releases:
   namespace: istio-system
   createNamespace: true
   chart: kiali/kiali-server
-  version: 2.14.0
+  version: 2.21.0
   values:
   - values/kiali.values.yaml