Fix SafeWaitable.add_to_wait_set typing annotation

Signed-off-by: Michel Hidalgo <[email protected]>

bdai_ros2_wrappers/bdai_ros2_wrappers/node.py

@@ -5,9 +5,10 @@
 from rclpy.callback_groups import CallbackGroup
 from rclpy.exceptions import InvalidHandle
 from rclpy.node import Node as BaseNode
-from rclpy.wait_set import WaitSet
 from rclpy.waitables import Waitable
 
+from rclpy.impl.implementation_singleton import rclpy_implementation as _rclpy
+
 from bdai_ros2_wrappers.callback_groups import NonReentrantCallbackGroup
 from bdai_ros2_wrappers.logging import MemoizingRcutilsLogger, as_memoizing_logger
 
@@ -21,7 +22,7 @@ def __init__(self, wrapped: Waitable) -> None:
     def __getattr__(self, name: str) -> Any:
         return getattr(self._wrapped, name)
 
-    def add_to_wait_set(self, wait_set: WaitSet) -> None:
+    def add_to_wait_set(self, wait_set: _rclpy.WaitSet) -> None:
         """Add waitable to `wait_set` safely."""
         with contextlib.suppress(InvalidHandle):
             self._wrapped.add_to_wait_set(wait_set)