chore(deps): update helm release grafana to v8.8.4

Author: renovate[bot]

infra/charts/cognative/Chart.yaml

@@ -79,5 +79,5 @@ dependencies:
 
   - name: grafana
     repository: https://grafana.github.io/helm-charts
-    version: 8.6.0
+    version: 8.8.4
     condition: grafana.enabled