bpo-31947: remove None default for names param in Enum._create_ (GH-4288)

(cherry picked from commit b8e21f1)

Co-authored-by: anentropic <[email protected]>

Author: miss-islington

Lib/enum.py

@@ -383,7 +383,7 @@ def __setattr__(cls, name, value):
             raise AttributeError('Cannot reassign members.')
         super().__setattr__(name, value)
 
-    def _create_(cls, class_name, names=None, *, module=None, qualname=None, type=None, start=1):
+    def _create_(cls, class_name, names, *, module=None, qualname=None, type=None, start=1):
         """Convenience method to create a new Enum class.
 
         `names` can be: