update proto in base type _update method

Author: alexluck-sift

python/lib/sift_client/sift_types/_base.py

@@ -50,6 +50,9 @@ def _update(self, other: BaseType[ProtoT, SelfT]) -> BaseType[ProtoT, SelfT]:
         for key in other.__class__.model_fields.keys():
             if key in self.model_fields:
                 self.__dict__.update({key: getattr(other, key)})
+
+        # Make sure we also update the proto since it is excluded
+        self.__dict__["proto"] = other.proto
         return self