autoreload 3 breaks with pydantic models

[iloveitaly]

[autoreload of browser.library failed: Traceback (most recent call last):
  File "/Users/mike/.cache/uv/archive-v0/kNbXlZ4I7_k672roqpeO9/lib/python3.13/site-packages/IPython/extensions/autoreload.py", line 278, in check
    superreload(m, reload, self.old_objects, self.shell)
    ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/mike/.cache/uv/archive-v0/kNbXlZ4I7_k672roqpeO9/lib/python3.13/site-packages/IPython/extensions/autoreload.py", line 508, in superreload
    update_generic(old_obj, new_obj)
    ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/Users/mike/.cache/uv/archive-v0/kNbXlZ4I7_k672roqpeO9/lib/python3.13/site-packages/IPython/extensions/autoreload.py", line 405, in update_generic
    update(a, b)
    ~~~~~~^^^^^^
  File "/Users/mike/.cache/uv/archive-v0/kNbXlZ4I7_k672roqpeO9/lib/python3.13/site-packages/IPython/extensions/autoreload.py", line 343, in update_class
    if (old_obj == new_obj) is True:
        ^^^^^^^^^^^^^^^^^^
  File "<frozen _collections_abc>", line 838, in __eq__
  File "<frozen _collections_abc>", line 898, in __iter__
  File "/Users/mike/.cache/uv/archive-v0/kNbXlZ4I7_k672roqpeO9/lib/python3.13/site-packages/pydantic/_internal/_mock_val_ser.py", line 47, in __iter__
    return self._get_built().__iter__()
           ~~~~~~~~~~~~~~~^^
  File "/Users/mike/.cache/uv/archive-v0/kNbXlZ4I7_k672roqpeO9/lib/python3.13/site-packages/pydantic/_internal/_mock_val_ser.py", line 58, in _get_built
    raise PydanticUserError(self._error_message, code=self._code)
pydantic.errors.PydanticUserError: Pydantic models should inherit from BaseModel, BaseModel cannot be instantiated directly

For further information visit https://errors.pydantic.dev/2.10/u/base-model-instantiated
]

however, autoreload 2 works fine. Ideally, we could catch this specific case so it doesn't break the autoreload functionality and just throws a warning.

I'm happy to help with this problem via a PR, I'm just not sure the best way to handle it.