bpo-38291: Fix a spurious warning when using help(object) (#27039)

help(object) via pydoc.TextDoc.docclass(object) iterates over the
subclasses of object, which includes typing.io and typing.re if typing
is imported. It tries to access cls.__module__ for each of those
sub-classes. This change suppresses warnings when accessing
cls.__module__.

Author: srittau

Lib/typing.py

@@ -2512,7 +2512,7 @@ def __enter__(self) -> 'TextIO':
 
 class _DeprecatedType(type):
     def __getattribute__(cls, name):
-        if name != "__dict__" and name in cls.__dict__:
+        if name not in ("__dict__", "__module__") and name in cls.__dict__:
             warnings.warn(
                 f"{cls.__name__} is deprecated, import directly "
                 f"from typing instead. {cls.__name__} will be removed "