fix(unplugin): correct unplugin-react plugin due to rspack deprecated buildin option

[Justinidlerz]

fix(unplugin): correct unplugin-react plugin due to rspack deprecated buildin option

Types of changes

• [ ] New feature
• [x] Bug fix
• [ ] Documentation change
• [ ] Coding style change
• [ ] Refactoring
• [ ] Performance improvement
• [ ] Test cases
• [ ] Continuous integration
• [ ] Typescript definition change
• [ ] Breaking change

Background and context

Fix issue https://github.com/arco-design/arco-plugins/issues/61

Solution

Use builtin:swc-loader loader instead to legacy

How is the change tested?

N/A

Changelog

Changelog(CN)	Changelog(EN)	Related issues
修复 unpack-react 在 rspack 版本更新引起的启动错误	Fix unpack-react startup errors on rspack	https://github.com/arco-design/arco-plugins/issues/61

Checklist:

• [x] Provide changelog for relevant changes (e.g. bug fixes and new features) if applicable.
• [ ] Changes are submitted to the appropriate branch (e.g. features should be submitted to feature branch and others should be submitted to master branch)

Other information