Merge pull request #725 from danigm/sqlalchemy-2.0.22

Update GenericAttributeImpl to work with SqlAlchemy 2.0.22

sqlalchemy_utils/generic.py

@@ -13,6 +13,13 @@
 
 
 class GenericAttributeImpl(attributes.ScalarAttributeImpl):
+    def __init__(self, *args, **kwargs):
+        # arguments received (class, key, dispatch)
+        # The attributes.AttributeImpl requires (class, key, default_function, dispatch)
+        # Setting None as default_function here
+        args = args[:2] + (None, ) + args[2:]
+        super().__init__(*args, **kwargs)
+
     def get(self, state, dict_, passive=attributes.PASSIVE_OFF):
         if self.key in dict_:
             return dict_[self.key]