chore(grafana-dashboards): update dashboard istio performance dashboa…

…rd ( 227 → 228 ) (#5386)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| Istio Performance Dashboard | major | `227` -> `228` |

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

@@ -304,7 +304,7 @@ spec:
         istio-perf:
           # renovate: depName="Istio Performance Dashboard"
           gnetId: 11829
-          revision: 227
+          revision: 228
           datasource: Prometheus
         istio-workload:
           # renovate: depName="Istio Workload Dashboard"