Fix Enum containment operand types on Python 3.10 and 3.11 (#16300)

Author: carljm

stdlib/enum.pyi

@@ -116,9 +116,9 @@ class EnumMeta(type):
     if sys.version_info >= (3, 12):
         def __contains__(self: type[Any], value: object) -> bool: ...
     elif sys.version_info >= (3, 11):
-        def __contains__(self: type[Any], member: object) -> bool: ...
+        def __contains__(self: type[Any], member: Enum) -> bool: ...
     else:
-        def __contains__(self: type[Any], obj: object) -> bool: ...
+        def __contains__(self: type[Any], obj: Enum) -> bool: ...
 
     def __getitem__(self: type[_EnumMemberT], name: str) -> _EnumMemberT: ...
     @_builtins_property