[experiments][serializers] Update code using annotate_full_name

beat/web/experiments/serializers.py

@@ -71,7 +71,7 @@ class ExperimentCreationSerializer(serializers.ModelSerializer):
 
     def toolchain_queryset(self):
         user = self.context.get("user")
-        return annotate_full_name(Toolchain).for_user(user, True)
+        return annotate_full_name(Toolchain.objects.for_user(user, True))
 
     def validate_name(self, name):
         # sanitize_name is a static method of Versionable models but Experiment