fix: use @shikijs/core instead of shiki/core for better tracing

[farnabaz]

🔗 Linked issue

❓ 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)
• ✨ 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

[nuxthub-admin]

✅ Deployed mdc

Deployed mdc 21cb0a5 to preview

🔗	fix-use-shikijs-core.mdc-btm.pages.dev
📌	8ec8fb2c.mdc-btm.pages.dev
📱	View QR Code

📋 View deployment logs

[pkg-pr-new]

npm i https://pkg.pr.new/@nuxtjs/mdc@421

commit: 21cb0a5