chore(deps): update av1155/houndarr to v1.6.0 (#4962)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [av1155/houndarr](https://github.com/av1155/houndarr) | minor | `v1.5.0` → `v1.6.0` |
| [ghcr.io/av1155/houndarr](https://github.com/av1155/houndarr) | minor | `v1.5.0` → `v1.6.0` |

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### Release Notes

<details>
<summary>av1155/houndarr (av1155/houndarr)</summary>

### [`v1.6.0`](https://github.com/av1155/houndarr/releases/tag/v1.6.0)

[Compare Source](https://github.com/av1155/houndarr/compare/v1.5.0...v1.6.0)

##### Added

- Opt-in upgrade search pass that periodically re-searches library items which already have a file and meet the quality cutoff, giving each `*arr` instance a chance to find better releases; each instance has independent batch size, cooldown, and hourly cap controls ([#&#8203;266](https://github.com/av1155/houndarr/issues/266)).

##### Changed

- A 3-second pause is now inserted between consecutive real searches within the same cycle to spread downstream indexer fan-out; the delay applies only to dispatched searches, not to skipped or errored items ([#&#8203;272](https://github.com/av1155/houndarr/issues/272)).

##### Fixed

- Navigating to the settings help page via the "What do these settings mean?" link inside the instance modal no longer leaves the page scroll-locked until refresh ([#&#8203;268](https://github.com/av1155/houndarr/issues/268)).
- Instance modal on mobile no longer briefly appears compact before expanding; the dialog now animates in fully populated ([#&#8203;268](https://github.com/av1155/houndarr/issues/268)).
- Dashboard instance cards now enter with a smooth container-level fade that matches the shell animation instead of a per-card flash ([#&#8203;268](https://github.com/av1155/houndarr/issues/268)).

</details>

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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: https://gitea.alexlebens.dev/alexlebens/infrastructure/pulls/4962
Co-authored-by: Renovate Bot <renovate-bot@alexlebens.net>
Co-committed-by: Renovate Bot <renovate-bot@alexlebens.net>

clusters/cl01tl/helm/houndarr/Chart.yaml

@@ -22,4 +22,4 @@ dependencies:
     repository: oci://harbor.alexlebens.net/helm-charts
 icon: https://raw.githubusercontent.com/av1155/houndarr/main/src/houndarr/static/img/houndarr-logo-dark.png
 # renovate: datasource=github-releases depName=av1155/houndarr
-appVersion: v1.5.0
+appVersion: v1.6.0