Use Union instead of |

src/together/cli/api/finetune.py

@@ -9,13 +9,18 @@
 from together.utils import finetune_price_to_dollars, log_warn, parse_timestamp
 from together.types.finetune import DownloadCheckpointType
 
+from typing import Union
+
 
 class DownloadCheckpointTypeChoice(click.Choice):
     def __init__(self) -> None:
         super().__init__([ct.value for ct in DownloadCheckpointType])
 
     def convert(
-        self, value: str, param: click.Parameter | None, ctx: click.Context | None
+        self,
+        value: str,
+        param: Union[click.Parameter, None],
+        ctx: Union[click.Context, None],
     ) -> DownloadCheckpointType:
         value = super().convert(value, param, ctx)
         return DownloadCheckpointType(value)