Update docker/setup-buildx-action action to v3

[balena-renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
docker/setup-buildx-action	action	major	v2 -> v3

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Release Notes

docker/setup-buildx-action (docker/setup-buildx-action)

### [`v3`](https://togithub.com/docker/setup-buildx-action/compare/v2...v3) [Compare Source](https://togithub.com/docker/setup-buildx-action/compare/v2...v3)

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Configuration

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

🚦 Automerge: Enabled.

♻ 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.

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

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This PR has been generated by Renovate Bot.

[balena-renovate[bot]]

Edited/Blocked Notification

Renovate will not automatically rebase this PR, because it does not recognize the last commit author and assumes somebody else may have edited the PR.

You can manually request rebase by checking the rebase/retry box above.

⚠ Warning: custom changes will be lost.

[balena-renovate[bot]]

Renovate Ignore Notification

Because you closed this PR without merging, Renovate will ignore this update. You will not get PRs for any future 3.x releases. But if you manually upgrade to 3.x then Renovate will re-enable minor and patch updates automatically.

If you accidentally closed this PR, or if you changed your mind: rename this PR to get a fresh replacement PR.