chore(deps): update helm release kube-prometheus-stack to v56.21.4 (#…

…422)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [kube-prometheus-stack](https://github.com/prometheus-operator/kube-prometheus) ([source](https://github.com/prometheus-community/helm-charts)) | patch | `56.21.2` -> `56.21.4` |

---

### Release Notes

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

### [`v56.21.4`](https://github.com/prometheus-community/helm-charts/releases/tag/kube-prometheus-stack-56.21.4)

[Compare Source](prometheus-community/helm-charts@kube-prometheus-stack-56.21.3...kube-prometheus-stack-56.21.4)

kube-prometheus-stack collects Kubernetes manifests, Grafana dashboards, and Prometheus rules combined with documentation and scripts to provide easy to operate end-to-end Kubernetes cluster monitoring with Prometheus using the Prometheus Operator.

#### What's Changed

-   \[kube-prometheus-stack] fix core-dns dashboard: Remove circular label filtering in variables, refresh values on time range change by [@&#8203;adberger](https://github.com/adberger) in prometheus-community/helm-charts#4349

**Full Changelog**: prometheus-community/helm-charts@kube-prometheus-stack-56.21.3...kube-prometheus-stack-56.21.4

### [`v56.21.3`](https://github.com/prometheus-community/helm-charts/releases/tag/kube-prometheus-stack-56.21.3)

[Compare Source](prometheus-community/helm-charts@kube-prometheus-stack-56.21.2...kube-prometheus-stack-56.21.3)

kube-prometheus-stack collects Kubernetes manifests, Grafana dashboards, and Prometheus rules combined with documentation and scripts to provide easy to operate end-to-end Kubernetes cluster monitoring with Prometheus using the Prometheus Operator.

#### What's Changed

-   \[kube-prometheus-stack] Fix multi-cluster selection in Prometheus Overview dashboard by [@&#8203;adberger](https://github.com/adberger) in prometheus-community/helm-charts#4336

**Full Changelog**: prometheus-community/helm-charts@prometheus-pushgateway-2.8.0...kube-prometheus-stack-56.21.3

</details>

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Reviewed-on: https://git.home/nrdufour/home-ops/pulls/422
Co-authored-by: Renovate <[email protected]>
Co-committed-by: Renovate <[email protected]>

kubernetes/main/apps/observability/kube-prometheus-stack/app/helm-release.yaml

@@ -10,7 +10,7 @@ spec:
   chart:
     spec:
       chart: kube-prometheus-stack
-      version: 56.21.2
+      version: 56.21.4
       sourceRef:
         kind: HelmRepository
         name: prometheus-community-charts