chore(ui): add bottom padding to DAG list (#55415)

The last DAG in the list was sticking to the bottom of the container, which sometimes made it difficult to see other DAGs

Author: serdukow

airflow-core/src/airflow/ui/src/pages/DagsList/DagsList.tsx

@@ -308,7 +308,7 @@ export const DagsList = () => {
         </HStack>
       </VStack>
       <ToggleTableDisplay display={display} setDisplay={setDisplay} />
-      <Box overflow="auto">
+      <Box overflow="auto" pb={8}>
         <DataTable
           cardDef={cardDef}
           columns={columns}