CI: Update helm to 4.0

Clemens Beckrequested to merge
cb-helm-4-ci into master

What does this MR do?

CI: Update helm to 4.0

Update Helm in CI from 3.18 to 4.0. Helm 3 continues to work but is not tested anymore.

Users are recommended to upgrade to Helm 4.

https://helm.sh/blog/helm-4-released/

Relates #6233 (closed)

Changelog: changed

Related issues

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  • Merge Request Title and Description are up to date, accurate, and descriptive.
  • MR targeting the appropriate branch.
  • MR has a green pipeline.
  • Documentation created/updated.
  • Tests added/updated, and test plan for scenarios not covered by automated tests.
  • Equivalent MR/issue for omnibus-gitlab opened.

Reviewers checklist

Edited by Clemens Beck

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