fix(prerender): decode uris in headers

[danielroe]

🔗 Linked issue

#1914
https://github.com/nuxt/nuxt/actions/runs/6923600748/job/18832536383?pr=24370#step:13:66

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 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)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Because we are using the scanned links to create a new URL we need to ensure they are decoded first:

https://github.com/unjs/nitro/blob/df7091dc9593b19977b6183497746e0e97a8b44f/src/prerender.ts#L396-L404

📝 Checklist

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