chore(deps): update helm release kube-prometheus-stack to v81.6.9 (#1433)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

deploy/kube-prometheus-stack/base/kustomization.yaml

@@ -22,7 +22,7 @@ helmCharts:
   - name: kube-prometheus-stack
     releaseName: kube-prometheus-stack
     namespace: monitoring
-    version: 81.6.7
+    version: 81.6.9
     valuesFile: values.yaml
     includeCRDs: true
     repo: https://prometheus-community.github.io/helm-charts