Never explicitly inherit from object in Python 3-only stubs (#6777)

stdlib/pyexpat/__init__.pyi

@@ -23,7 +23,7 @@ XML_PARAM_ENTITY_PARSING_ALWAYS: int
 _Model = tuple[int, int, Optional[str], tuple[Any, ...]]
 
 @final
-class XMLParserType(object):
+class XMLParserType:
     def Parse(self, __data: str | bytes, __isfinal: bool = ...) -> int: ...
     def ParseFile(self, __file: SupportsRead[bytes]) -> int: ...
     def SetBase(self, __base: str) -> None: ...