chore(grafana-dashboards): update dashboard istio control plane dashb…

…oard ( 226 → 227 ) (#5284)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| Istio Control Plane Dashboard | major | `226` -> `227` |

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### Configuration

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kubernetes/kyak/apps/monitoring/grafana/app/helmrelease.yaml

@@ -284,7 +284,7 @@ spec:
         istio-cp:
           # renovate: depName="Istio Control Plane Dashboard"
           gnetId: 7645
-          revision: 226
+          revision: 227
           datasource: Prometheus
         istio-mesh:
           # renovate: depName="Istio Mesh Dashboard"