About sourceMapFilename, the built sourceMappingUrl and Webpack are inconsistent

![Image](https://github.com/user-attachments/assets/2889f837-bdfd-47c1-9f87-d3ad894cf7dd)
同样的配置 
rspack 出来的：![Image](https://github.com/user-attachments/assets/790095ee-e6e4-4eca-90b3-beaf405b0c57)
webpack 出来的：![Image](https://github.com/user-attachments/assets/d1c63422-dfb2-468d-b989-ecf61da59536)
