chore(deps): update helm release grafana to v8.6.4 (#332)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [grafana](https://grafana.com)
([source](https://redirect.github.com/grafana/helm-charts)) | patch |
`8.6.3` -> `8.6.4` |

---

> [!WARNING]
> Some dependencies could not be looked up. Check the Dependency
Dashboard for more information.

---

### Release Notes

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

###
[`v8.6.4`](https://redirect.github.com/grafana/helm-charts/releases/tag/grafana-8.6.4)

[Compare
Source](https://redirect.github.com/grafana/helm-charts/compare/grafana-8.6.3...grafana-8.6.4)

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

#### What's Changed

- \[grafana] Add configuration options for the number of retries done by
the sidecar by [@&#8203;cbos](https://redirect.github.com/cbos) in
[https://github.com/grafana/helm-charts/pull/3454](https://redirect.github.com/grafana/helm-charts/pull/3454)

#### New Contributors

- [@&#8203;cbos](https://redirect.github.com/cbos) made their first
contribution in
[https://github.com/grafana/helm-charts/pull/3454](https://redirect.github.com/grafana/helm-charts/pull/3454)

**Full Changelog**:
grafana/helm-charts@helm-loki-6.22.0...grafana-8.6.4

</details>

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cluster/apps/monitoring/grafana/app/helm-release.yaml

@@ -10,7 +10,7 @@ spec:
     spec:
       # renovate: registryUrl=https://grafana.github.io/helm-charts
       chart: grafana
-      version: 8.6.3
+      version: 8.6.4
       sourceRef:
         kind: HelmRepository
         name: grafana