Update Helm release grafana to v8.5.12

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
grafana (source)	patch	8.5.11 -> 8.5.12

---

Release Notes

grafana/helm-charts (grafana)

### [`v8.5.12`](https://redirect.github.com/grafana/helm-charts/compare/grafana-8.5.11...grafana-8.5.12) [Compare Source](https://redirect.github.com/grafana/helm-charts/compare/grafana-8.5.11...grafana-8.5.12)

---

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.