feat(deps): update Rspack to v1.2.8

[chenjiahan]

Summary

Update Rspack to v1.2.8.

Related Links

• https://github.com/web-infra-dev/rspack/releases

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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Lighthouse	1 paths audited Performance: 73 (🔴 down 4 from production) Accessibility: 97 (no change from production) Best Practices: 100 (no change from production) SEO: 100 (no change from production) PWA: 60 (no change from production) View the detailed breakdown and full score reports

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