chore: update @utoo/pack to 1.4.12

[fireairforce]

What changed

• Updated @utoo/pack-cli from ^1.4.12-alpha.6 to ^1.4.12.
• Refreshed pnpm-lock.yaml so @utoo/pack, @utoo/pack-shared, and platform packages resolve to 1.4.12.

Why

This moves the benchmark project from the alpha Utoo package to the current npm latest release.

[coderabbitai]

Walkthrough

This PR updates the @utoo/pack-cli devDependency in package.json from the alpha version ^1.4.12-alpha.6 to the stable release ^1.4.12. The change promotes the build tool from pre-release to production-ready status.

Poem

🐰 From alpha to the stable road,
Our pack-cli now carries the load,
No more experiments, just proven ground—
The finest build tools have been found! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The title mentions updating '@utoo/pack' to 1.4.12, but the actual change is to '@utoo/pack-cli' (a different package name).	Update the title to accurately reflect the changed package: 'chore: update @utoo/pack-cli to 1.4.12' or similar.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The pull request description clearly explains what changed (dependency version updates) and why (moving to npm latest release).

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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