fix: flatlist ref typing

Author: Viraj-10

src/components/basic/FlatList/types.ts

@@ -1,6 +1,7 @@
 import type { StyledProps } from '../../../theme/types';
 import type { FlatListProps } from 'react-native';
 import type { CustomProps, PlatformProps } from '../../types';
+import type { MutableRefObject } from 'react';
 
 export interface InterfaceFlatListProps<ItemT>
   extends FlatListProps<ItemT>,
@@ -10,6 +11,8 @@ export interface InterfaceFlatListProps<ItemT>
    * pass props to contentContainerStyle, and this also resolved NB tokens.
    */
   _contentContainerStyle?: Partial<IFlatListProps<ItemT>>;
+
+  ref?: MutableRefObject<any>;
 }
 
 export type IFlatListProps<ItemT> = InterfaceFlatListProps<ItemT> &