Fix 🛠: Cross-Platform Path Resolution for empty.js in Locales Plugin

[ohansFavour]

Closes #7462

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

🧢 Your Project:

[reidbarber]

Thanks for the PR! If you sign the CLA, then close and re-open this to trigger a rebuild, the build should pass.