[d3-chart] fixed types for children render function in tooltips (#924)

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## Motivation and Context
#923 
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semcore/d3-chart/CHANGELOG.md

@@ -2,6 +2,12 @@
 
 CHANGELOG.md standards are inspired by [keepachangelog.com](https://keepachangelog.com/en/1.0.0/).
 
+## [3.19.5] - 2023-11-24
+
+### Fixed
+
+- Correct types for `Tooltip`s children render function.
+
 ## [3.18.4] - 2023-11-21
 
 ### Changed

semcore/d3-chart/src/types/Hover.d.ts

@@ -22,9 +22,9 @@ type HoverTooltip = (<X, Y>(
     y?: Y;
     children: (props: {
       /** Index in `data` array of the current item */
-      xIndex: X extends string ? string : never;
+      xIndex: X extends string ? number : never;
       /** Index in `data` array of the current item */
-      yIndex: Y extends string ? string : never;
+      yIndex: Y extends string ? number : never;
     }) => { children: ReturnEl };
   } & Omit<BoxProps, 'children'>,
 ) => ReturnEl) &