chore(deps): update helm release kube-prometheus-stack to v67.8.0 (#378)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[kube-prometheus-stack](https://redirect.github.com/prometheus-operator/kube-prometheus)
([source](https://redirect.github.com/prometheus-community/helm-charts))
| minor | `67.7.0` -> `67.8.0` |

---

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---

### Release Notes

<details>
<summary>prometheus-community/helm-charts
(kube-prometheus-stack)</summary>

###
[`v67.8.0`](https://redirect.github.com/prometheus-community/helm-charts/compare/kube-prometheus-stack-67.7.0...kube-prometheus-stack-67.8.0)

[Compare
Source](https://redirect.github.com/prometheus-community/helm-charts/compare/kube-prometheus-stack-67.7.0...kube-prometheus-stack-67.8.0)

</details>

---

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cluster/apps/monitoring/kube-prometheus-stack/app/helm-release.yaml

@@ -10,7 +10,7 @@ spec:
     spec:
       # renovate: registryUrl=https://prometheus-community.github.io/helm-charts
       chart: kube-prometheus-stack
-      version: 67.7.0
+      version: 67.8.0
       sourceRef:
         kind: HelmRepository
         name: prometheus-community