code formatting

src/Shared/HandyControl_Shared/Controls/Panel/Grid/Col.cs

@@ -32,7 +32,7 @@ namespace HandyControl.Controls
         private static bool OnSpanValidate(object value)
         {
             var v = (int) value;
-            return v >= 1 && v <= 24;
+            return v is >= 1 and <= 24;
         }
 
         public int Span