chore(deps): update grafana to v7.3.9 (#353)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [grafana](https://grafana.com)
([source](https://togithub.com/grafana/helm-charts)) | patch | `7.3.8`
-> `7.3.9` |

---

### Release Notes

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

###
[`v7.3.9`](https://togithub.com/grafana/helm-charts/releases/tag/grafana-7.3.9)

[Compare
Source](https://togithub.com/grafana/helm-charts/compare/grafana-7.3.8...grafana-7.3.9)

The leading tool for querying and visualizing time series and metrics.

#### What's Changed

- \[grafana] fix: lookup volumename on pvc by
[@&#8203;guilhem](https://togithub.com/guilhem) in
[https://github.com/grafana/helm-charts/pull/3041](https://togithub.com/grafana/helm-charts/pull/3041)

#### New Contributors

- [@&#8203;guilhem](https://togithub.com/guilhem) made their first
contribution in
[https://github.com/grafana/helm-charts/pull/3041](https://togithub.com/grafana/helm-charts/pull/3041)

**Full Changelog**:
grafana/helm-charts@grafana-sampling-0.1.1...grafana-7.3.9

</details>

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src/grafana/common/zarf.yaml

@@ -14,7 +14,7 @@ components:
         localPath: ../chart
       - name: grafana
         url: https://grafana.github.io/helm-charts/
-        version: 7.3.8
+        version: 7.3.9
         namespace: grafana
         valuesFiles:
           - ../values/values.yaml