only specify __root__ with TYPE_CHECKING
hotfix for #https://git.geomar.de/digital-earth/dasf/dasf-messaging-python/-/merge_requests/35#note_37501
@daniel-eggert this should solve the issue you mention. We can either merge this MR directly, or fix your branch to use the branch of this MR. I think we should just merge this MR and rerun your pipeline in https://git.geomar.de/digital-earth/dasf/dasf-messaging-python/-/merge_requests/35