use client to connect to the cluster server, and the connection will only be established to one instance.

### Version

2.6.0

### Bug description

When the mina ssh client uses the domain name to request the cluster ssh server, the ssh client does not achieve load balancing.

### Actual behavior

When I use mina ssh client to connect to mina ssh server, I use the domain name for access. When the domain name is a.com, the corresponding IPs of a.com are 10.0.0.1, 10.0.0.2, and 10.0.0.3, but I found that the ssh client will always only connect to the mina ssh server at 10.0.0.1, while other services are idle. . Even after the server of 10.0.0.1 hangs up, the ssh client is still requesting the instance of 10.0.0.1

### Expected behavior

When using the mina ssh client to request a clustered ssh server, the ssh client balances access to each ssh server instance each time a connection is established.

### Relevant log output

_No response_

### Other information

_No response_