[Fleet - Integrations] Fix overflow of integration card (elastic#194539)

## Summary

Hey team, here is a small fix for the shadows not to be cropped in
integrations grid container, based on this request:
[https://github.com/elastic/UX/issues/132](url)

x-pack/plugins/fleet/public/applications/integrations/sections/epm/components/package_list_grid/grid.tsx

@@ -120,7 +120,7 @@ export const GridColumn = ({
           <EuiAutoSizer disableHeight>
             {({ width }: { width: number }) => (
               <List
-                style={{ height: '100%' }}
+                style={{ height: '100%', overflow: 'visible' }}
                 ref={listRef}
                 layout="vertical"
                 itemCount={Math.ceil(list.length / 3)}