refactor(cli.py): exchange union use for '|' as per ruff UP007

Author: mattgebert

numpydoc/cli.py

@@ -4,14 +4,14 @@
 import ast
 from collections.abc import Sequence
 from pathlib import Path
-from typing import List, Union
+from typing import List
 
 from .docscrape_sphinx import get_doc_object
 from .hooks import utils, validate_docstrings
 from .validate import ERROR_MSGS, Validator, validate
 
 
-def render_object(import_path: str, config: Union[List[str], None] = None) -> int:
+def render_object(import_path: str, config: List[str] | None = None) -> int:
     """Test numpydoc docstring generation for a given object."""
     # TODO: Move Validator._load_obj to a better place than validate
     print(get_doc_object(Validator._load_obj(import_path), config=dict(config or [])))
@@ -117,7 +117,7 @@ def _parse_config(s):
     return ap
 
 
-def main(argv: Union[Sequence[str], None] = None) -> int:
+def main(argv: Sequence[str] | None = None) -> int:
     """CLI for numpydoc."""
     ap = get_parser()