Update index.d.ts (#22615)

Kendo documentation specifies number as configuration for categoryAxis.title.margin 

categoryAxis.title.margin Number |Object (default: 5)
The margin of the title. A numeric value will set all margins.

types/kendo-ui/index.d.ts

@@ -11178,8 +11178,8 @@ declare namespace kendo.dataviz.ui {
         border?: ChartXAxisItemTitleBorder;
         color?: string;
         font?: string;
-        margin?: ChartXAxisItemTitleMargin;
-        padding?: ChartXAxisItemTitlePadding;
+        margin?: ChartXAxisItemTitleMargin | number;
+        padding?: ChartXAxisItemTitlePadding | number;
         position?: string;
         rotation?: number;
         text?: string;