[charts] Claim Artifact Hub ownership for the appuio charts

[mrlunchbox777]

Summary

As the Helm project administrator currently receiving Artifact Hub notifications
I want the current APPUiO project maintainers to claim the appuio Artifact Hub repository
So that ownership notifications reach the project that publishes and maintains these charts

Context

Artifact Hub repository:
https://artifacthub.io/packages/search?repo=appuio

The listing currently serves charts from:
https://charts.appuio.ch

The validated source repository is:
https://github.com/appuio/charts

Please use Artifact Hub's automated ownership-claim process:
https://artifacthub.io/docs/topics/repositories/#ownership-claim

Please confirm here after the claim succeeds. If this repository is no longer responsible for that Helm feed, please redirect us to its current owner or team contact.

Out of Scope

• No chart behavior or publishing changes are requested.

Further links

• Artifact Hub repository ID: 7f87bbd0-25d4-47a4-b34b-855fa5be3ab7
• Source repository: https://github.com/appuio/charts

Acceptance criteria

• Given the current maintainer owns this project, when the Artifact Hub ownership process is completed, then the repository is no longer owned by Helm and the claim is confirmed in this issue.