build: Fix beta clippy issue (useless_vec)

warning: useless use of `vec!`
   --> test_infra/src/lib.rs:111:30
    |
111 |             let mut events = vec![epoll::Event::new(epoll::Events::empty(), 0); 1];
    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: you can use an array directly: `[epoll::Event::new(epoll::Events::empty(), 0); 1]`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_vec
    = note: `#[warn(clippy::useless_vec)]` on by default

Signed-off-by: Yu Li <liyu.yukiteru@bytedance.com>
(cherry picked from commit d0dbc7fb4d)

src/main.rs

@@ -1562,7 +1562,7 @@ mod unit_tests {
 
     #[test]
     fn test_valid_vm_config_vsock() {
-        vec![
+        [
             (
                 vec![
                     "cloud-hypervisor",