[robotlb] fix chart name for installing (#1237)

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## What this PR does
Rename of chart name for fixing installing issues

### Release note

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```release-note
[robotlb] fix chart name for installing
```

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## Summary by CodeRabbit

* **Chores**
  * Updated the Helm chart name to "cozy-hetzner-robotlb".

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/system/hetzner-robotlb/Chart.yaml

@@ -1,3 +1,3 @@
 apiVersion: v2
-name: hetzner-robotlb
+name: cozy-hetzner-robotlb
 version: 0.1.3  # Placeholder, the actual version will be automatically set during the build process