refactor: itemAs rename

Author: tugcekucukoglu

packages/primereact/src/datepicker/root/DatePickerRoot.tsx

@@ -19,7 +19,7 @@ export const DatePickerRoot = withComponent({
         const { id, props: _props, ptmi, cx, state, changeVisibleState } = instance;
         const props = _props as DatePickerRootInternalProps;
 
-        const PopoverRoot = props.popoverRoot as React.ElementType<{
+        const PopoverRoot = props.itemAs as React.ElementType<{
             children?: React.ReactNode;
             onOpenChange?: (event: { value: boolean }) => void;
             open?: boolean;