fix(@toss/utils): When iOS Request Desktop Website is enabled, there is an issue with the userAgent.

[fe-dudu]

Overview

https://forums.developer.apple.com/forums/thread/119186 When the "Request Desktop Website" option is enabled in iOS Safari, there is an issue with the userAgent being incorrect.

• iOS Version: 17.5
• Device Model: iPhone 15 Pro
• Browser: Safari

Reproduction Steps

1. Open Safari on iPhone 15 Pro.
2. Navigate to any website (safari).
3. Enable the "Request Desktop Website" option in Safari settings.
4. Check the userAgent string using developer tools or JavaScript.

Expect

Mozilla/5.0 (iPhone; ...

Result

PR Checklist

• [x] I read and included theses actions below

1. I have read the Contributing Guide
2. I have written documents and tests, if needed.

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