Make BaseException's init accept object instead of Any (#1518)

Author: ilinum

stdlib/3/builtins.pyi

@@ -900,7 +900,7 @@ class BaseException:
     __cause__ = ...  # type: BaseException
     __context__ = ...  # type: BaseException
     __traceback__ = ...  # type: TracebackType
-    def __init__(self, *args: Any) -> None: ...
+    def __init__(self, *args: object) -> None: ...
     def with_traceback(self, tb: Any) -> BaseException: ...
 
 class GeneratorExit(BaseException): ...