fixes(Dialogs): Warning CS0642 Possible mistaken empty statement

src/Avalonia.Dialogs/AboutAvaloniaDialog.xaml.cs

@@ -30,13 +30,13 @@ namespace Avalonia.Dialogs
             }
             else
             {
-                using (Process process = Process.Start(new ProcessStartInfo
+                using Process process = Process.Start(new ProcessStartInfo
                 {
                     FileName = RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? url : "open",
                     Arguments = RuntimeInformation.IsOSPlatform(OSPlatform.OSX) ? $"{url}" : "",
                     CreateNoWindow = true,
                     UseShellExecute = RuntimeInformation.IsOSPlatform(OSPlatform.Windows)
-                }));
+                });
             }
         }