Update CloudMirror sample for CppWinRT 2 and VS2022

Windows-classic-samples/Samples/CloudMirror/README.md

Line 33 in 67a8cdd

    
           This sample was created for Windows 10 Version 1809 using Visual Studio 2017 using the Windows SDK 10.0.17763.0, but in many cases it will run unaltered using later versions. Please provide feedback on this sample!

Objection! The sample doesn't work with VS2022, VC143 and CppWinRT 2.
Please update the CloudMirror sample to work with newer VC toolkits and CppWinRT 2.

Upgraded!