Fix copy-and-paste err in test.yml

Signed-off-by: Jiahao XU <[email protected]>

Author: NobodyXu

.github/workflows/test.yml

@@ -31,7 +31,6 @@ jobs:
       - run: |
           # Wait for startup of openssh-server
           timeout 15 ./wait_for_sshd_start_up.sh
-          sleep 15
           chmod 600 .test-key
           mkdir /tmp/openssh-rs
           ssh -i .test-key -v -p 2222 -l test-user 127.0.0.1 -o StrictHostKeyChecking=accept-new -o UserKnownHostsFile=/tmp/openssh-rs/known_hosts whoami