fix: fix tests not working in Python 3.13

Author: null8626

topgg/user.py

@@ -107,7 +107,7 @@ def __repr__(self) -> str:
   def __len__(self) -> int:
     return len(self.__votes)
 
-  def __iter__(self) -> Iterator[Vote]:
+  def __iter__(self) -> 'Iterator[Vote]':
     return iter(self.__votes)