chore: use pnpm version for releases

[chenjiahan]

Summary

Use pnpm's built-in version command for release preparation, matching rspack-vue-loader. Replace npx bumpp with pnpm version -m "release: v%s" to create version commits with the standard release message.

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed2026-09-08T03:14:53.173722Z	1e3b3cb	PR opened

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[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit:1e3b3cb43e

ℹ️ About Codex in GitHub

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