fix: incorrect type for CatalogFilterBy

JIRA: TRIVIAL
risk: low

Author: hkad98

gooddata-sdk/gooddata_sdk/catalog/filter_by.py

@@ -1,6 +1,8 @@
 # (C) 2024 GoodData Corporation
 from __future__ import annotations
 
+from typing import Optional
+
 import attr
 from gooddata_api_client.model.filter_by import FilterBy
 
@@ -9,7 +11,7 @@
 
 @attr.s(auto_attribs=True, kw_only=True)
 class CatalogFilterBy(Base):
-    label_type: str
+    label_type: Optional[str]
 
     @staticmethod
     def client_class() -> type[FilterBy]: