chore(base-cluster/dependencies): update oauth2-proxy docker tag to v6 (

#1146)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [oauth2-proxy](https://github.com/bitnami/charts)
([source](https://github.com/bitnami/charts/tree/HEAD/bitnami/oauth2-proxy))
| major | `5.x` -> `6.x` |

---

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

---

### Release Notes

<details>
<summary>bitnami/charts (oauth2-proxy)</summary>

###
[`v6.0.0`](https://github.com/bitnami/charts/blob/HEAD/bitnami/oauth2-proxy/CHANGELOG.md#600-2024-08-13)

- \[bitnami/oauth2-proxy] Update dependencies
([#&#8203;28856](https://github.com/bitnami/charts/pull/28856))

</details>

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charts/base-cluster/values.yaml

@@ -117,7 +117,7 @@ global:
     bitnami:
       url: oci://docker.io/bitnamicharts
       charts:
-        oauth2-proxy: 5.x
+        oauth2-proxy: 6.x
         metrics-server: 7.x
         external-dns: 8.x
         grafana-tempo: 3.x