rename var updates -> existing

Author: T4rk1n

dash/_callback_context.py

@@ -252,9 +252,9 @@ def timing_information(self):
     def set_props(self, component_id: typing.Union[str, dict], props: dict):
         ctx_value = _get_context_value()
         _id = stringify_id(component_id)
-        updates = ctx_value.updated_props.get(_id)
-        if updates is not None:
-            ctx_value.updated_props[_id] = {**updates, **props}
+        existing = ctx_value.updated_props.get(_id)
+        if existing is not None:
+            ctx_value.updated_props[_id] = {**existing, **props}
         else:
             ctx_value.updated_props[_id] = props