[3.12] gh-122311: Fix typo in the pickle error formatting code (GH-122312) (GH-122315)

(cherry picked from commit 7c29218)

Co-authored-by: Serhiy Storchaka <[email protected]>

Author: miss-islington

Lib/pickle.py

@@ -1151,7 +1151,7 @@ def _save_toplevel_by_name(self, module_name, name):
             except UnicodeEncodeError:
                 raise PicklingError(
                     "can't pickle global identifier '%s.%s' using "
-                    "pickle protocol %i" % (module, name, self.proto)) from None
+                    "pickle protocol %i" % (module_name, name, self.proto)) from None
 
     def save_type(self, obj):
         if obj is type(None):