chore(deps): update home-assistant to v2026.4.0 (#5369)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [ghcr.io/home-assistant/home-assistant](https://www.home-assistant.io/) ([source](https://github.com/home-assistant/core)) | minor | `2026.3.4` → `2026.4.0` |
| [home-assistant/core](https://github.com/home-assistant/core) | minor | `2026.3.4` → `2026.4.0` |

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### Release Notes

<details>
<summary>home-assistant/core (ghcr.io/home-assistant/home-assistant)</summary>

### [`v2026.4.0`](https://github.com/home-assistant/core/releases/tag/2026.4.0)

[Compare Source](https://github.com/home-assistant/core/compare/2026.3.4...2026.4.0)

<https://www.home-assistant.io/blog/2026/04/01/release-20264/>

</details>

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### Configuration

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🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about these updates again.

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Reviewed-on: #5369
Co-authored-by: Renovate Bot <renovate-bot@alexlebens.net>
Co-committed-by: Renovate Bot <renovate-bot@alexlebens.net>

clusters/cl01tl/helm/home-assistant/Chart.yaml

@@ -24,4 +24,4 @@ dependencies:
     repository: oci://harbor.alexlebens.net/helm-charts
 icon: https://cdn.jsdelivr.net/gh/selfhst/icons/png/home-assistant.png
 # renovate: datasource=github-releases depName=home-assistant/core
-appVersion: 2026.3.4
+appVersion: 2026.4.0