fix: do not invoke slots in computed functions

[danielroe]

🔗 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

If you run nuxt/nuxt.com locally you'll see these warnings spamming in the console:

[14:30:13]  WARN  [Vue warn]: Slot "default" invoked outside of the render function: this will not track dependencies used in the slot. Invoke the slot function inside the render function instead.at <ProseCodeTree>
at <AsyncComponentWrapper>
at <MDCRenderer>
at <MDC>
at <AsyncComponentWrapper>

this aims to fix it by not invoking slots in a computed function but doing so in render lifecycle hooks

📝 Checklist

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

[pkg-pr-new]

npm i https://pkg.pr.new/@nuxt/ui@6133

commit: 03ef1f5