fix typing

sleepyStick · sleepyStick · commit 825f8edf504d · 2025-06-23T13:04:37.000-07:00
diff --git a/pymongo/pool_options.py b/pymongo/pool_options.py
@@ -384,7 +384,7 @@ def __init__(
 
         _truncate_metadata(self.__metadata)
 
-    def _update_metadata(self, driver: DriverInfo):
+    def _update_metadata(self, driver: DriverInfo) -> None:
         """Updates the client's metadata"""
 
         metadata = copy.deepcopy(self.__metadata)
