Update Helm release loki-stack to v2.8.9 (#1148)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [loki-stack](https://grafana.com/loki)
([source](https://togithub.com/grafana/helm-charts)) | patch | `2.8.8`
-> `2.8.9` |

---

### Release Notes

<details>
<summary>grafana/helm-charts</summary>

###
[`v2.8.9`](https://togithub.com/grafana/helm-charts/releases/tag/loki-stack-2.8.9)

[Compare
Source](https://togithub.com/grafana/helm-charts/compare/loki-stack-2.8.8...loki-stack-2.8.9)

Loki: like Prometheus, but for logs.

</details>

---

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packages/logging-pgl/zarf.yaml

@@ -19,7 +19,7 @@ components:
       - name: loki-stack
         releaseName: zarf-loki-stack
         url: https://grafana.github.io/helm-charts
-        version: 2.8.8
+        version: 2.8.9
         namespace: zarf
         valuesFiles:
           - pgl-values.yaml