fix: Update index.ts (#6268)

* Update index.ts

VxeGridPropTypes.原文件缺少这个，现在补全！

* Update index.ts

增加空格！

packages/effects/plugins/src/vxe-table/index.ts

@@ -3,4 +3,4 @@ export type { VxeTableGridOptions } from './types';
 export * from './use-vxe-grid';
 
 export { default as VbenVxeGrid } from './use-vxe-grid.vue';
-export type { VxeGridListeners, VxeGridProps } from 'vxe-table';
+export type { VxeGridListeners, VxeGridProps, VxeGridPropTypes } from 'vxe-table';