Removed legacy usage of Union[]

tests/test_i18n_sync.py

@@ -1,5 +1,5 @@
 from pathlib import Path
-from typing import Any, List, Union
+from typing import Any, List
 
 import pytest
 from libbot.i18n import _, in_all_locales, in_every_locale
@@ -19,7 +19,7 @@ from libbot.i18n import _, in_all_locales, in_every_locale
 def test_i18n_get(
     key: str,
     args: List[str],
-    locale: Union[str, None],
+    locale: str | None,
     expected: Any,
     location_locale: Path,
 ):