fix: upgrade vite to 2.7.12

[pi0]

🔗 Linked issue

nuxt/nuxt#13234

❓ 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)

📚 Description

• Use null instead of empty string for default config to allow overriding (fix: improve array config merging vitejs/vite#6344)
  • To be fixed in vite to allow overriding in all conditions fix: improve alias merging vitejs/vite#6497
• Module.normalizePlugins : Cannot read property 'map' of undefined fix(config): merge array correctly vitejs/vite#6499

📝 Checklist

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

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