Missing TargetPlaformMinVersion, causing issues with UWP under VS2022

[wrobelda]

Apparently TargetPlaformMinVersion is required to build UWP under VS2022, see microsoft/vcpkg#23757 (search for for the keyword in speech)

Possible Fix

Adding TargetPlatformMinVersion to _winrt.vcxproj fixes that issue.

Note that it likely applies to all the other of your forks. Probably worth adding to the regular, non-_winrt project files, too.