paramiko: get_banner in transport returns bytes (#4974)

Author: iwanb

third_party/2and3/paramiko/transport.pyi

@@ -143,7 +143,7 @@ class Transport(Thread, ClosingContextManager):
     def set_subsystem_handler(self, name: str, handler: Type[SubsystemHandler], *larg: Any, **kwarg: Any) -> None: ...
     def is_authenticated(self) -> bool: ...
     def get_username(self) -> Optional[str]: ...
-    def get_banner(self) -> Optional[str]: ...
+    def get_banner(self) -> Optional[bytes]: ...
     def auth_none(self, username: str) -> List[str]: ...
     def auth_password(self, username: str, password: str, event: Optional[Event] = ..., fallback: bool = ...) -> List[str]: ...
     def auth_publickey(self, username: str, key: PKey, event: Optional[Event] = ...) -> List[str]: ...