[ScreenCaptureKit] Update to Xcode 26 beta 1-5.#23566

rolfbjarne merged 2 commits intoxcode26.0dotnet/macios:xcode26.0from

dev/rolf/s/xcode26.0-b12345-screencapturekitdotnet/macios:dev/rolf/s/xcode26.0-b12345-screencapturekitCopy head branch name to clipboard