chore(tools): bump Docker toolchain to latest stable versions

[arcbox-labs]

Summary

• docker: 29.6.1 -> 29.6.2

Checksums verified by downloading binaries and computing SHA-256.

Auto-generated by cargo xtask release check-tool-updates.

[pullfrog]

✅ No new issues found.

Reviewed changes — an auto-generated dependency patch bump from cargo xtask release check-tool-updates.

• Bump docker host-CLI tool 29.6.1 → 29.6.2 — updates the version pin plus the arm64/x86_64 sha256 checksums for the docker entry in assets.lock. No other [[tools]] entries, the [boot] manifest, or code paths are touched.

This bumps the host-side CLI docker ([[tools]], downloaded to ~/.arcbox/runtime/bin and exposed to the VM via VirtioFS), which is distinct from the guest runtime dockerd shipped in the [boot] bundle (0.6.9). The resulting short-window version divergence between the two is explicitly documented as expected in the assets.lock header comment (tolerated via Docker API negotiation). The docs/boot-assets.md "Docker 29.6.1" references describe the boot-bundle runtime binaries, not this tool, so they are not made stale by the change.

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