Chore: remove unused var in ModelProviderFactory (#23690)

api/core/model_runtime/utils/helper.py

@@ -1,10 +0,0 @@
-import pydantic
-from pydantic import BaseModel
-
-
-def dump_model(model: BaseModel) -> dict:
-    if hasattr(pydantic, "model_dump"):
-        # FIXME mypy error, try to fix it instead of using type: ignore
-        return pydantic.model_dump(model)  # type: ignore
-    else:
-        return model.model_dump()