marshal: improve bytes handling (#9047)

Co-authored-by: Jelle Zijlstra <[email protected]>

Author: sobolevn

stdlib/marshal.pyi

@@ -1,8 +1,9 @@
-from typing import IO, Any
+from _typeshed import ReadableBuffer, SupportsRead, SupportsWrite
+from typing import Any
 
 version: int
 
-def dump(__value: Any, __file: IO[Any], __version: int = ...) -> None: ...
-def load(__file: IO[Any]) -> Any: ...
+def dump(__value: Any, __file: SupportsWrite[bytes], __version: int = ...) -> None: ...
+def load(__file: SupportsRead[bytes]) -> Any: ...
 def dumps(__value: Any, __version: int = ...) -> bytes: ...
-def loads(__bytes: bytes) -> Any: ...
+def loads(__bytes: ReadableBuffer) -> Any: ...