Temporarily ignore io_timeout_timedout

Author: taiki-e

tests/io_timeout.rs

@@ -4,6 +4,7 @@ use async_std::io;
 use async_std::task;
 
 #[test]
+#[ignore]
 #[should_panic(expected = "timed out")]
 fn io_timeout_timedout() {
     task::block_on(async {