Import from collections.abc wherever possible (#7635)

stdlib/wsgiref/handlers.pyi

@@ -1,7 +1,8 @@
 from _typeshed import OptExcInfo
 from _typeshed.wsgi import ErrorStream, InputStream, StartResponse, WSGIApplication, WSGIEnvironment
 from abc import abstractmethod
-from typing import IO, Callable, MutableMapping
+from collections.abc import Callable, MutableMapping
+from typing import IO
 
 from .headers import Headers
 from .util import FileWrapper

stdlib/wsgiref/util.pyi

@@ -1,6 +1,7 @@
 import sys
 from _typeshed.wsgi import WSGIEnvironment
-from typing import IO, Any, Callable
+from collections.abc import Callable
+from typing import IO, Any
 
 __all__ = ["FileWrapper", "guess_scheme", "application_uri", "request_uri", "shift_path_info", "setup_testing_defaults"]
 

stdlib/wsgiref/validate.pyi

@@ -1,5 +1,6 @@
 from _typeshed.wsgi import ErrorStream, InputStream, WSGIApplication
-from typing import Any, Callable, Iterable, Iterator, NoReturn
+from collections.abc import Callable, Iterable, Iterator
+from typing import Any, NoReturn
 
 __all__ = ["validator"]