Import from collections.abc wherever possible (#7635)

stdlib/unittest/runner.pyi

@@ -1,7 +1,8 @@
 import unittest.case
 import unittest.result
 import unittest.suite
-from typing import Callable, Iterable, TextIO
+from collections.abc import Callable, Iterable
+from typing import TextIO
 from typing_extensions import TypeAlias
 
 _ResultClassType: TypeAlias = Callable[[TextIO, bool, int], unittest.result.TestResult]