Update Helm release vault to v0.31.0 (#1584)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [vault](https://www.vaultproject.io) ([source](https://github.com/hashicorp/vault-helm)) | minor | `0.30.1` -> `0.31.0` |

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### Release Notes

<details>
<summary>hashicorp/vault-helm (vault)</summary>

### [`v0.31.0`](https://github.com/hashicorp/vault-helm/blob/HEAD/CHANGELOG.md#0310-September-25-2025)

[Compare Source](https://github.com/hashicorp/vault-helm/compare/v0.30.1...v0.31.0)

Changes:

- Default `vault` version updated to 1.20.4
- Default `vault-csi-provider` version updated to 1.6.0
- Change default `csi.daemonSet.providersDir` to "/var/run/secrets-store-csi-providers"

Features:

- csi: Add Red Hat certified vault-csi-provider image to OpenShift defaults [GH-1134](https://github.com/hashicorp/vault-helm/pull/1134)

Improvements:

- server: Add metricRelabelings to serviceMonitor options [GH-1131](https://github.com/hashicorp/vault-helm/pull/1131)

</details>

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### Configuration

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Reviewed-on: #1584
Co-authored-by: Renovate Bot <renovate-bot@alexlebens.net>
Co-committed-by: Renovate Bot <renovate-bot@alexlebens.net>

clusters/cl01tl/platform/vault/Chart.yaml

@@ -19,7 +19,7 @@ maintainers:
   - name: alexlebens
 dependencies:
   - name: vault
-    version: 0.30.1
+    version: 0.31.0
     repository: https://helm.releases.hashicorp.com
   - name: app-template
     alias: snapshot