chore(grafana-dashboards): update dashboard prometheus ( 3 → 6 )

[parsec-renovate]

This PR contains the following updates:

Package	Update	Change
Prometheus	major	3 -> 6

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[github-actions]

--- kubernetes/apps/observability/grafana/app Kustomization: flux-system/grafana HelmRelease: observability/grafana

+++ kubernetes/apps/observability/grafana/app Kustomization: flux-system/grafana HelmRelease: observability/grafana

@@ -186,13 +186,13 @@

             datasource: Prometheus
             url: https://raw.githubusercontent.com/kubernetes/ingress-nginx/main/deploy/grafana/dashboards/request-handling-performance.json
         prometheus:
           prometheus:
             datasource: Prometheus
             gnetId: 19105
-            revision: 3
+            revision: 6
       unifi:
         unifi-insights:
           datasource: Prometheus
           gnetId: 11315
           revision: 9
         unifi-network-sites: