fix(useLocale): unique symbol to use in @nuxt/ui-pro

[benjamincanac]

🔗 Linked issue

Resolves #3549

❓ 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

📝 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@3603

commit: e0f5183

[nuxthub-admin]

✅ Deployed ui3

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[benjamincanac]

@hywax I had to use Symbol.for because when used in @nuxt/ui-pro the injection wasn't working: https://github.com/nuxt/ui-pro/blob/v3/src/runtime/composables/useLocalePro.ts#L11