fix: port upstream clone cookie

[wattanx]

🔗 Linked issue

Fixes: #1039

❓ 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

Port upstream to fix the problem.

When a cookie is an object, changing a property within it will change the original referenced object as well, meaning isEqual doesn't detect the change. Instead, we can clone the value straight away so we can detect differences.

📝 Checklist

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