style: use target version practices

src/jcloud_docsgen/utils.py

@@ -20,7 +20,6 @@ import errno
 import os
 import pathlib
 import types
-from typing import Union
 
 try:
     from warnings import deprecated
@@ -154,10 +153,10 @@ def assert_that_is_instance(
     obj: object,
     class_or_tuple: type | types.UnionType | tuple[type, ...],
 ) -> None:
-    if not isinstance(class_or_tuple, Union[type, types.UnionType, tuple]):
+    if not isinstance(class_or_tuple, (type, types.UnionType, tuple)):
         raise TypeError(
-            f"class_or_tuple: expected 'Union[type, types.UnionType, "
-            f"tuple[type, ...]]', 'got {type(class_or_tuple).__name__}'",
+            f"class_or_tuple: expected 'type | types.UnionType, tupl"
+            f"e[type, ...]', 'got {type(class_or_tuple).__name__}'",
         )
     if not isinstance(obj, class_or_tuple):
         if isinstance(class_or_tuple, (tuple, types.UnionType)):