chore(deps): update valkey docker tag to v0.4.0 (#4572)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [valkey](https://github.com/valkey-io/valkey) | minor | `0.3.0` → `0.4.0` |

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### Configuration

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This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
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Reviewed-on: #4572
Co-authored-by: Renovate Bot <renovate-bot@alexlebens.net>
Co-committed-by: Renovate Bot <renovate-bot@alexlebens.net>

clusters/cl01tl/helm/outline/Chart.lock

@@ -10,6 +10,6 @@ dependencies:
   version: 7.8.0
 - name: valkey
   repository: oci://harbor.alexlebens.net/helm-charts
-  version: 0.3.0
-digest: sha256:4b67eca7ac2acf1607b2c3f06d714d347a64ec99dcf51acfa65c4e773c9047fa
-generated: "2026-03-09T22:05:16.86734349Z"
+  version: 0.4.0
+digest: sha256:315941cca92632a42d42fe2d98f01d3e8a18dbde1c729e466f76a446a7d93440
+generated: "2026-03-09T23:08:20.752831748Z"