fix error for python version 3.9

src/utils/contacts/check_email_existence.py

@@ -1,8 +1,8 @@
+import logging
 import os
 import sys
-import logging
 from pathlib import Path
-from typing import Iterable, List, Optional, Set, Any
+from typing import Iterable, List, Optional, Set, Any, Union
 
 # Ensure project root is on sys.path so imports like 'src.*' work when running this
 # file directly (python src/utils/contacts/check_email_existence.py)
@@ -41,7 +41,7 @@ def _normalize_email(email: Optional[str]) -> Optional[str]:
 
 
 def check_email_existence(
-    file_path: str | Path,
+    file_path: Union[str, Path],
     mail_list: Iterable,
     exclude_domains: Optional[Set[str]] = None,
     verbose: bool = True,