fix: deleted users in Notion workspace

[joscha]

For:

  Unable to extract tag using discriminator 'type' [type=union_tag_not_found, input_value={'object': 'user', 'id': ...81cf-a9db-0002d5695b14'}, input_type=dict]
    For further information visit https://errors.pydantic.dev/2.11/v/union_tag_not_found

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/nix/store/3x13dv76kxw9qzdkh1443wfg33gds8wk-python3-3.12.11-env/lib/python3.12/concurrent/futures/thread.py", line 59, in run
    result = self.fn(*self.args, **self.kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joscha/dev/dlt-source-notion/.devenv/state/venv/lib/python3.12/site-packages/dlt/extract/utils.py", line 255, in _parallel_gen
    return next(gen)  # type: ignore[call-overload]
           ^^^^^^^^^
  File "/Users/joscha/dev/dlt-source-notion/dlt_source_notion/__init__.py", line 219, in database_resource
    for pages in iterate_paginated_api(client.databases.query, database_id=database_id):
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joscha/dev/dlt-source-notion/dlt_source_notion/__init__.py", line 82, in iterate_paginated_api
    response = function(**kwargs, start_cursor=next_cursor)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joscha/dev/dlt-source-notion/.devenv/state/venv/lib/python3.12/site-packages/pydantic_api/notion/sdk/endpoints/databases.py", line 100, in query
    return self._validate_response(raw_resp, QueryDatabaseResponse)

needs:

• Fix: allow partial user objects for created_by and last_edited_by page properties stevieflyer/pydantic-api-models-notion#17
• fix: allow pages with deleted user models stevieflyer/pydantic-api-sdk-notion#6