Fix typo in test_import

Co-authored-by: Victor Stinner <vstinner@python.org>

Author: dr-carlos

Lib/test/test_import/__init__.py

@@ -1264,7 +1264,7 @@ class Spec:
         spec.name = "builtins"
         self.assertIs(_imp.create_builtin(spec), builtins)
 
-        name = None
+        spec.name = None
         with self.assertRaisesRegex(TypeError, 'name must be string, not NoneType'):
             _imp.create_builtin(spec)