quick fix for py39

Author: aseembits93

codeflash/cli_cmds/cmd_init.py

@@ -855,7 +855,8 @@ def enter_api_key_and_save_to_rc() -> None:
 
 
 def create_bubble_sort_file_and_test(args: Namespace) -> tuple[str, str]:
-    bubble_sort_content = """def sorter(arr: list[int] | list[float]) -> list[int] | list[float]:
+    bubble_sort_content = """from typing import Union, List
+def sorter(arr: Union[List[int],List[float]]) -> Union[List[int],List[float]]:
     for i in range(len(arr)):
         for j in range(len(arr) - 1):
             if arr[j] > arr[j + 1]: