[pre-commit.ci] auto fixes from pre-commit.com hooks

Author: pre-commit-ci[bot]

stdlib/tokenize.pyi

@@ -1,6 +1,5 @@
 import sys
 from _typeshed import StrOrBytesPath
-from builtins import open as _builtin_open
 from collections.abc import Callable, Generator, Iterable, Sequence
 from re import Pattern
 from token import *

stdlib/unittest/loader.pyi

@@ -1,5 +1,4 @@
 import unittest.case
-import unittest.result
 import unittest.suite
 from collections.abc import Callable, Sequence
 from re import Pattern