Third-party stubs: import from collections.abc where possible (#7637)

stubs/google-cloud-ndb/google/cloud/ndb/context.pyi

@@ -1,4 +1,5 @@
-from typing import Any, Callable, NamedTuple
+from collections.abc import Callable
+from typing import Any, NamedTuple
 
 from google.cloud.ndb import Key, exceptions as exceptions
 

stubs/google-cloud-ndb/google/cloud/ndb/model.pyi

@@ -1,7 +1,7 @@
 import datetime
 from _typeshed import Self
-from collections.abc import Iterable, Sequence
-from typing import Any, Callable, NoReturn
+from collections.abc import Callable, Iterable, Sequence
+from typing import Any, NoReturn
 from typing_extensions import Literal, TypeAlias
 
 from google.cloud.ndb import exceptions, key as key_module, query as query_module, tasklets as tasklets_module