chore(deps): update helm release kube-prometheus-stack to v77.9.1 (#776)

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

Author: renovate[bot]

kubernetes-services/templates/prometheus.yaml

@@ -13,7 +13,7 @@ spec:
   sources:
     - chart: kube-prometheus-stack
       repoURL: https://prometheus-community.github.io/helm-charts
-      targetRevision: 77.8.0
+      targetRevision: 77.9.1
       helm:
         values: |
           prometheusOperator: