Import os_helper directly.

Author: jaraco

tests/fixtures.py

@@ -8,16 +8,12 @@
 import textwrap
 from importlib import resources
 
-from jaraco.test.cpython import from_test_support, try_import
+from test.support import os_helper  # type: ignore[import-untyped]
 
 from . import _path
 from ._path import FilesSpec
 from .compat.py312 import import_helper
 
-os_helper = try_import('os_helper') or from_test_support(
-    'FS_NONASCII', 'skip_unless_symlink', 'temp_dir'
-)
-
 
 @contextlib.contextmanager
 def tmp_path():