Add mem::drop for clippy in test "run_all_sql_test_files"

Author: a-gonzalo

tests/sql_test_files/mod.rs

@@ -14,7 +14,8 @@ async fn run_all_sql_test_files() {
     wait_for_echo_server(port).await;
 
     for test_file in test_files {
-        let _ = Box::pin(run_sql_test(&test_file, &app_data, &echo_handle, port));
+        let test = Box::pin(run_sql_test(&test_file, &app_data, &echo_handle, port));
+        std::mem::drop(test);
     }
 
     let _ = shutdown_tx.send(());