fix: correct return type of useRequestFetch

[wattanx]

🔗 Linked issue

Fixes: #1385

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

I will fix the types to match upstream.
However, since Bridge does not use nitro-nightly, the import will come from nitropack.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[pkg-pr-new]

Open in Stackblitz

npm i https://pkg.pr.new/@nuxt/bridge@1389

npm i https://pkg.pr.new/@nuxt/bridge-schema@1389

commit: 055a6e9