refactor: remove unused error import from utils.rs

Author: kosiew

src/utils.rs

@@ -20,7 +20,7 @@ use crate::{
     common::data_type::PyScalarValue,
     dataframe::PyDataFrame,
     dataset::Dataset,
-    errors::{py_datafusion_err, PyDataFusionError, PyDataFusionResult},
+    errors::{PyDataFusionError, PyDataFusionResult},
     table::PyTableProvider,
     TokioRuntime,
 };