Catch additional exception

`File.GetLastWriteTimeUtc` can throw several exceptions. One of them (`NotSupportedException`) was not covered in our catch clauses.

This exception was observed in microsoft/WindowsAppSDK#1525, where an invalid path string was being provided. When this exception is caught, the file is considered unavailable, and we log the path in the up-to-date check output. This will unblock further diagnosis.

src/Microsoft.VisualStudio.ProjectSystem.Managed/IO/Win32FileSystem.cs

@@ -85,6 +85,9 @@ public bool TryGetLastFileWriteTimeUtc(string path, [NotNullWhen(true)]out DateT
             catch (UnauthorizedAccessException)
             {
             }
+            catch (NotSupportedException)
+            {
+            }
 
             result = null;
             return false;