feat(deps): update @rspack/core to 1.4.0

[chenjiahan]

Summary

Update @rspack/core to 1.4.0

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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[Copilot]

Pull Request Overview

This PR updates the @rspack/core dependency from the release candidate to the stable 1.4.0 version.

• Bump @rspack/core from 1.4.0-rc.0 to 1.4.0 in package.json

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

Comments suppressed due to low confidence (1)

packages/core/package.json:55

• Consider updating the project’s changelog or release notes to document the upgrade to @rspack/core 1.4.0 and highlight any notable changes from the previous RC version.

    "@rspack/core": "1.4.0",