Fix linting issues (#12898)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

stdlib/@tests/test_cases/check_os_path.py

@@ -1,9 +1,10 @@
 from __future__ import annotations
+
 from _typeshed import StrOrBytesPath
 from os import PathLike
 from os.path import abspath, expanduser, expandvars
-from typing_extensions import assert_type
 from typing import AnyStr, Union
+from typing_extensions import assert_type
 
 
 def test_str_path(str_path: StrOrBytesPath) -> None:

stdlib/ast.pyi

@@ -2036,7 +2036,6 @@ class NodeVisitor:
         @deprecated("Replaced by visit_Constant; removed in Python 3.14")
         def visit_Ellipsis(self, node: Ellipsis) -> Any: ...  # type: ignore[deprecated]
 
-
 class NodeTransformer(NodeVisitor):
     def generic_visit(self, node: AST) -> AST: ...
     # TODO: Override the visit_* methods with better return types.

stdlib/warnings.pyi

@@ -1,5 +1,5 @@
-import sys
 import re
+import sys
 from _warnings import warn as warn, warn_explicit as warn_explicit
 from collections.abc import Sequence
 from types import ModuleType, TracebackType