slightly stronger typing of _convert_json_types

Signed-off-by: varun-edachali-dbx <varun.edachali@databricks.com>

Author: varun-edachali-dbx

src/databricks/sql/result_set.py

@@ -510,7 +510,7 @@ def _convert_json_to_arrow(self, rows):
         names = [col[0] for col in self.description]
         return pyarrow.Table.from_arrays(columns, names=names)
 
-    def _convert_json_types(self, rows):
+    def _convert_json_types(self, rows: List) -> List:
         """
         Convert raw data rows to Row objects with named columns based on description.
         Also converts string values to appropriate Python types based on column metadata.