test: fix regression test for defaultdict factory repr

Author: KowalskiThomas

Lib/test/test_defaultdict.py

@@ -212,12 +212,12 @@ def __call__(self):
                 return {}
             def __repr__(self):
                 repr(dd)
-                return "ProblematicFactory()"
+                return f"ProblematicFactory for {dd}"
 
         dd = defaultdict(ProblematicFactory())
         # Should not raise RecursionError
         r = repr(dd)
-        self.assertIn('ProblematicFactory()', r)
+        self.assertIn("ProblematicFactory for", r)
 
 if __name__ == "__main__":
     unittest.main()