Update Helm release victoria-metrics-k8s-stack to v0.27.6

Author: renovate[bot]

ops/monitoring/Chart.yaml

@@ -3,7 +3,7 @@ name: monitoring
 version: 1.0.0
 dependencies:
 - name: victoria-metrics-k8s-stack
-  version: 0.27.5
+  version: 0.27.6
   repository: https://victoriametrics.github.io/helm-charts/
 - name: promtail
   version: 6.16.6