fix(bench-vortex): Add missing Future import to random_access.rs

Author: claude

bench-vortex/src/bin/random_access.rs

@@ -2,6 +2,7 @@
 // SPDX-FileCopyrightText: Copyright the Vortex contributors
 
 use std::fs::File;
+use std::future::Future;
 use std::io::{Write, stdout};
 use std::path::PathBuf;