chore: remove un used import

Author: kuisathaverat

src/test/java/com/cloudbees/jenkins/plugins/sshagent/SSHAgentBase.java

@@ -25,7 +25,6 @@
 import org.apache.sshd.server.keyprovider.SimpleGeneratorHostKeyProvider;
 import org.apache.sshd.server.session.ServerSession;
 import org.apache.sshd.server.shell.ShellFactory;
-import static org.apache.sshd.server.ServerAuthenticationManager.WELCOME_BANNER;
 
 public class SSHAgentBase {