Update ghcr.io/grafana/grafana-build-tools Docker tag to v0.15.1

[grafanarenovatebot[bot]]

This PR contains the following updates:

Package	Update	Change
ghcr.io/grafana/grafana-build-tools	patch	v0.15.0 -> v0.15.1

---

Release Notes

grafana/grafana-build-tools (ghcr.io/grafana/grafana-build-tools)

### [`v0.15.1`](https://togithub.com/grafana/grafana-build-tools/blob/HEAD/CHANGELOG.md#v0151---2024-07-03) [Compare Source](https://togithub.com/grafana/grafana-build-tools/compare/v0.15.1...v0.15.1) #### \[v0.15.1] - 2024-07-03 ### [`v0.15.1`](https://togithub.com/grafana/grafana-build-tools/blob/HEAD/CHANGELOG.md#v0151---2024-07-03) [Compare Source](https://togithub.com/grafana/grafana-build-tools/compare/v0.15.0...v0.15.1) #### \[v0.15.1] - 2024-07-03

---

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 has been generated by Renovate Bot.