fix(dll): json stringify non-numeric request in code generation

[inottn]

Summary

fix #9076

In webpack, the request type can be a number, so when using JSON.stringify, no need to check if the request is a numeric string. In Rspack, we need to do this, or it will break existing tests.

Checklist

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

[netlify]

✅ Deploy Preview for rspack ready!

Built without sensitive environment variables

Name	Link
🔨 Latest commit	ca83032
🔍 Latest deploy log	https://app.netlify.com/sites/rspack/deploys/679128605b42f70008596000
😎 Deploy Preview	https://deploy-preview-9087--rspack.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[codspeed-hq]

CodSpeed Performance Report

Merging #9087 will not alter performance

_{Comparing inottn:fix/dll (ca83032) with main (fedb661)}

🎉 Hooray! codspeed-rust just leveled up to 2.7.2!

A heads-up, this is a breaking change and it might affect your current performance baseline a bit. But here's the exciting part - it's packed with new, cool features and promises improved result stability 🥳!
Curious about what's new? Visit our releases page to delve into all the awesome details about this new version.

Summary

✅ 3 untouched benchmarks