chore(base-cluster/dependencies): update helm release velero to v6 (#812

)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [velero](https://togithub.com/vmware-tanzu/velero)
([source](https://togithub.com/vmware-tanzu/helm-charts)) | major |
`5.4.1` -> `6.0.0` |

---

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

---

### Release Notes

<details>
<summary>vmware-tanzu/helm-charts (velero)</summary>

###
[`v6.0.0`](https://togithub.com/vmware-tanzu/helm-charts/releases/tag/velero-6.0.0)

[Compare
Source](https://togithub.com/vmware-tanzu/helm-charts/compare/velero-5.4.1...velero-6.0.0)

A Helm chart for velero

#### What's Changed

- fix(velero): remove useless `nodeAgent.privileged` by
[@&#8203;cwrau](https://togithub.com/cwrau) in
[https://github.com/vmware-tanzu/helm-charts/pull/509](https://togithub.com/vmware-tanzu/helm-charts/pull/509)

#### New Contributors

- [@&#8203;cwrau](https://togithub.com/cwrau) made their first
contribution in
[https://github.com/vmware-tanzu/helm-charts/pull/509](https://togithub.com/vmware-tanzu/helm-charts/pull/509)

**Full Changelog**:
vmware-tanzu/helm-charts@velero-5.4.1...velero-6.0.0

</details>

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charts/base-cluster/values.yaml

@@ -164,7 +164,7 @@ global:
     vmware:
       url: https://vmware-tanzu.github.io/helm-charts
       charts:
-        velero: 5.4.1
+        velero: 6.0.0
       condition: "{{ not (empty .Values.backup.backupStorageLocations) }}"
     open-telemetry:
       url: https://open-telemetry.github.io/opentelemetry-helm-charts