conn: return boolean in SSHClient

is_connected is actually an integer so we need to convert it

pytest_mh/conn/ssh.py

@@ -433,7 +433,7 @@ def requested_auth_methods(self) -> list[str]:
 
     @property
     def connected(self) -> bool:
-        return self.__conn.is_connected
+        return bool(self.__conn.is_connected)
 
     def connect(self) -> None:
         """