[PhotosUI] Implement Xcode 16.0 beta 1-6 changes. (#21041)

Note: there were no changes in beta 2, beta 3, beta 4, beta 5 or beta 6.

Author: rolfbjarne

src/photosui.cs

@@ -695,6 +695,11 @@ interface PHPickerFilter : NSCopying {
 		[Export ("timelapseVideosFilter")]
 		PHPickerFilter TimelapseVideosFilter { get; }
 
+		[NoWatch, NoTV, Mac (15, 0), iOS (18, 0), MacCatalyst (18, 0)]
+		[Static]
+		[Export ("spatialMediaFilter")]
+		PHPickerFilter SpatialMediaFilter { get; }
+
 		[NoWatch, NoTV, Mac (13, 0), iOS (15, 0)]
 		[MacCatalyst (15, 0)]
 		[Static]