fix(helm): update chart cilium ( 1.15.5 → 1.15.6 ) (#3807)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [cilium](https://cilium.io/)
([source](https://togithub.com/cilium/cilium)) | patch | `1.15.5` ->
`1.15.6` |

---

### Release Notes

<details>
<summary>cilium/cilium (cilium)</summary>

###
[`v1.15.6`](https://togithub.com/cilium/cilium/compare/1.15.5...1.15.6)

[Compare
Source](https://togithub.com/cilium/cilium/compare/1.15.5...1.15.6)

</details>

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Co-authored-by: repo-jeeves[bot] <106431701+repo-jeeves[bot]@users.noreply.github.com>

kubernetes/main/apps/kube-system/cilium/app/helm-release.yaml

@@ -14,7 +14,7 @@ spec:
   chart:
     spec:
       chart: cilium
-      version: 1.15.5
+      version: 1.15.6
       sourceRef:
         kind: HelmRepository
         name: cilium-charts

kubernetes/main/bootstrap/talos/apps/helmfile.yaml

@@ -24,7 +24,7 @@ releases:
   - name: cilium
     namespace: kube-system
     chart: cilium/cilium
-    version: 1.15.5
+    version: 1.15.6
     values: ["../../../apps/kube-system/cilium/app/helm-values.yaml"]
     needs:
       - observability/prometheus-operator-crds