chore(deps): update helm release kube-prometheus-stack to v55.6.0 (#287)

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)) | minor | `55.5.1` -> `55.6.0` |

---

### Release Notes

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

### [`v55.6.0`](https://github.com/prometheus-community/helm-charts/releases/tag/kube-prometheus-stack-55.6.0)

[Compare Source](prometheus-community/helm-charts@kube-prometheus-stack-55.5.2...kube-prometheus-stack-55.6.0)

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] adding global sampleLimit to prometheusSpec by [@&#8203;husseinferas](https://github.com/husseinferas) in prometheus-community/helm-charts#4125

#### New Contributors

-   [@&#8203;husseinferas](https://github.com/husseinferas) made their first contribution in prometheus-community/helm-charts#4125

**Full Changelog**: prometheus-community/helm-charts@kube-prometheus-stack-55.5.2...kube-prometheus-stack-55.6.0

### [`v55.5.2`](https://github.com/prometheus-community/helm-charts/releases/tag/kube-prometheus-stack-55.5.2)

[Compare Source](prometheus-community/helm-charts@kube-prometheus-stack-55.5.1...kube-prometheus-stack-55.5.2)

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] install service monitors in same namespace when ignoreNamespaceSelectors by [@&#8203;anthr76](https://github.com/anthr76) in prometheus-community/helm-charts#3953

#### New Contributors

-   [@&#8203;anthr76](https://github.com/anthr76) made their first contribution in prometheus-community/helm-charts#3953

**Full Changelog**: prometheus-community/helm-charts@alertmanager-snmp-notifier-0.3.0...kube-prometheus-stack-55.5.2

</details>

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Reviewed-on: https://git.home/nrdufour/home-ops/pulls/287
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: 55.5.1
+      version: 55.6.0
       sourceRef:
         kind: HelmRepository
         name: prometheus-community-charts