chore: change dict to {}

Author: fatelei

Lib/test/test_zoneinfo/test_zoneinfo.py

@@ -1561,7 +1561,7 @@ def test_weak_cache_descriptor_use_after_free(self):
 
         class BombDescriptor:
             def __get__(self, obj, owner):
-                return dict()
+                return {}
 
         class EvilZoneInfo(ZoneInfo):
             pass