chore: update renovate config

[shinGangan]

🔗 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 like performance)
• [ ] ✨ New feature (a non-breaking change that adds functionality)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)
• [x] 🧹 Chore (updates to the build process or auxiliary tools and libraries)

📚 Description

Other Nuxt modules often use the Nuxt side Renovate config. So I changed the config from UnJS to Nuxt.

• related: nuxt/renovate-config-nuxt

📝 Checklist

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