Fix build issue on Xcode 27

[GiacomoLeopizzi]

Summary of Changes

Fixes a build issue caused by the custom URLSession.data(for:) backward-compatibility shim colliding with the system URLSession.data(for:) API (available since iOS 15 / macOS 12) when building with newer Xcode/SDK toolchains.

Changes:

• Renamed the custom URLSession.data(for:) helper to data(forHTTP:) to avoid the naming collision and ambiguity with the built-in API.
• The helper now prefers the native data(for:) on iOS 15+ / macOS 12+, and only falls back to the withCheckedThrowingContinuation + dataTask implementation on older OS versions. (Previously the whole extension was marked @available(..., obsoleted:), which broke the build.)
• Updated the call site in APIRequest.send(uRLRequest:with:) to use the new data(forHTTP:) method.

Test Data or Screenshots

N/A — no behavioral change. This is a build/compatibility fix.

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