chore(deps): update docker/setup-buildx-action action to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker/setup-buildx-action	action	major	v3 → v4

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Release Notes

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

v4

Compare Source

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Configuration

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• Automerge
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📥 Commits

Reviewing files that changed from the base of the PR and between e2f1adc and 577bead.

📒 Files selected for processing (1)

• .github/workflows/build-docker.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch renovate/docker-setup-buildx-action-4.x

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