Update pyiceberg/expressions/__init__.py

Co-authored-by: Fokko Driesprong <fokko@apache.org>

Author: Aniketsy

pyiceberg/expressions/__init__.py

@@ -42,7 +42,7 @@
 from pyiceberg.typedef import L, StructProtocol
 from pyiceberg.types import DoubleType, FloatType, NestedField
 from pyiceberg.utils.singleton import Singleton
-from pyiceberg.utils.pydantic import IcebergBaseModel
+from pyiceberg.typedef import IcebergBaseModel
 from pydantic import Field