fix: Remove duplicate C++ lib for cocoapod

[brustolin]

📜 Description

Xcode 15 automatically add libc++, we dont need to add it as well.

💡 Motivation and Context

Removes a warning in the app compilation step.

💚 How did you test it?

📝 Checklist

You have to check all boxes before merging:

• I reviewed the submitted code.
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

[brustolin]

It seems that Xcode 14 also dont need the references for c++ libs.
I believe its safe to merge this change because Xcode 13 is deprecated.