chore(deps): update helm release kube-prometheus-stack to v51 (#81)

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)) | major | `50.3.1` -> `51.0.0` |

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### Release Notes

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

### [`v51.0.0`](https://github.com/prometheus-community/helm-charts/releases/tag/kube-prometheus-stack-51.0.0)

[Compare Source](prometheus-community/helm-charts@kube-prometheus-stack-50.3.1...kube-prometheus-stack-51.0.0)

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] operator bump to 0.68.0 by [@&#8203;DrFaust92](https://github.com/DrFaust92) in prometheus-community/helm-charts#3770

**Full Changelog**: prometheus-community/helm-charts@prometheus-cloudwatch-exporter-0.25.2...kube-prometheus-stack-51.0.0

</details>

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Reviewed-on: https://git.home/nrdufour/home-ops/pulls/81
Co-authored-by: Renovate <[email protected]>
Co-committed-by: Renovate <[email protected]>

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

@@ -9,7 +9,7 @@ spec:
   chart:
     spec:
       chart: kube-prometheus-stack
-      version: 50.3.1
+      version: 51.0.0
       sourceRef:
         kind: HelmRepository
         name: prometheus-community-charts