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

[![Mend
Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

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>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR has been generated by [Mend
Renovate](https://www.mend.io/free-developer-tools/renovate/). View
repository job log
[here](https://app.renovatebot.com/dashboard#github/defenseunicorns/zarf).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNC43NC4yIiwidXBkYXRlZEluVmVyIjoiMzQuODEuMCJ9-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

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