Update azure/setup-helm action to v4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
azure/setup-helm	action	major	v3 -> v4

---

Release Notes

azure/setup-helm (azure/setup-helm)

### [`v4`](https://redirect.github.com/azure/setup-helm/compare/v3...v4) [Compare Source](https://redirect.github.com/azure/setup-helm/compare/v3...v4)

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

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

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

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

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.