feat(helm): update chart kube-prometheus-stack ( 75.13.0 → 75.15.0 )

| datasource | package               | from    | to      |
| ---------- | --------------------- | ------- | ------- |
| helm       | kube-prometheus-stack | 75.13.0 | 75.15.0 |

Author: renovate[bot]

kubernetes/core/prometheus/helm-release.yml

@@ -9,7 +9,7 @@ spec:
   chart:
     spec:
       chart: kube-prometheus-stack
-      version: 75.13.0
+      version: 75.15.0
       interval: 30m
       sourceRef:
         kind: HelmRepository