chore: upgrade to h3@1.8-rc

[pi0]

🔗 Linked issue

❓ 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

Upgrade to h3 1.8 RC to verify new changes

https://github.com/unjs/h3/releases/tag/v1.8.0-rc.0

📝 Checklist

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

[codecov]

Codecov Report

Merging #1510 (43ada17) into main (be25a21) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1510   +/-   ##
=======================================
  Coverage   76.22%   76.22%           
=======================================
  Files          73       73           
  Lines        7456     7456           
  Branches      732      732           
=======================================
  Hits         5683     5683           
  Misses       1772     1772           
  Partials        1        1