Update ssh.go

部署测试模拟发现，如果设置失败会大量产生这种Warning，可能因为部署过程kk有大量ssh连接操作的缘故，故降到Debug级别

Co-Authored-By: zmoon460 <[email protected]>
Signed-off-by: zmoon460 <[email protected]>

Author: zmoon460

cmd/kk/pkg/core/connector/ssh.go

@@ -259,7 +259,7 @@ func (c *connection) session() (*ssh.Session, error) {
 	}
 
 	if err := sess.Setenv("LANG", "en_US.UTF-8"); err != nil { // try make sure work with english language environments
-		logger.Log.Warningf("Warning: Failed to enforce LANG=en_US.UTF-8. (Error: %v)", err)
+		logger.Log.Debugf("Failed to enforce LANG=en_US.UTF-8. (Error: %v)", err)
 	}
 
 	return sess, nil