Update chart kube-prometheus-stack to 88.3.0

Author: renovate[bot]

k8s-apps/kube-prometheus-stack/Chart.yaml

@@ -6,7 +6,7 @@ version: 0.1.0
 dependencies:
   - name: kube-prometheus-stack
     repository: https://prometheus-community.github.io/helm-charts
-    version: 87.21.0
+    version: 88.3.0
   - name: app-template
     alias: grafana-mcp-server
     repository: https://bjw-s-labs.github.io/helm-charts