chore: lint source code using Ruff

src/jcloud_docsgen/core/python/arguments.py

@@ -13,17 +13,18 @@
 # limitations under the License.
 
 from __future__ import annotations
-from enum import Enum
-from typing import Union
+
 import ast
-from ...utils import assert_that_is_instance
+import keyword
+import types
+from enum import Enum
+
 from ...exceptions import (
     InvalidPythonAnnotationError,
     InvalidPythonIdentifierError,
     PythonArgumentStructureError,
 )
-import keyword
-import types
+from ...utils import assert_that_is_instance
 
 __all__ = [
     'PythonArgumentKind',
@@ -49,17 +50,17 @@ class PythonFunctionArgument:
     :param kind: The kind of the argument.
     :type kind: ArgumentKind
     :param default: The default value of the argument.
-    :type default: Union[str, None]
+    :type default: str | None
     :param annotation: The type annotation of the argument.
-    :type annotation: Union[str, None]
+    :type annotation: str | None
     """
 
     def __init__(
         self,
         name: str,
         kind: PythonArgumentKind,
-        default: Union[str, None],
-        annotation: Union[str, None],
+        default: str | None,
+        annotation: str | None,
     ) -> None:
         assert_that_is_instance(name, str)
         assert_that_is_instance(kind, PythonArgumentKind)