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

(cherry picked from commit b8e21f12891382bc0aac5ccd13dcb4a990d65e0a)

Co-authored-by: anentropic <ego@anentropic.com>
diff --git a/Lib/enum.py b/Lib/enum.py
index 8c8409b..576de03 100644
--- a/Lib/enum.py
+++ b/Lib/enum.py
@@ -383,7 +383,7 @@
             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: