Fix anext type error

Author: NoahStapp

test/asynchronous/test_collation.py

@@ -21,6 +21,7 @@
 from test.utils import EventListener
 from typing import Any
 
+from pymongo.asynchronous.helpers import anext
 from pymongo.collation import (
     Collation,
     CollationAlternate,

test/test_collation.py

@@ -37,6 +37,7 @@
     UpdateMany,
     UpdateOne,
 )
+from pymongo.synchronous.helpers import next
 from pymongo.write_concern import WriteConcern
 
 _IS_SYNC = True