add conditioning to get_parameter_value method import (ros-controls#1428)

Author: saikishor

controller_manager/controller_manager/spawner.py

@@ -32,7 +32,13 @@
 from rcl_interfaces.msg import Parameter
 from rclpy.duration import Duration
 from rclpy.node import Node
-from rclpy.parameter import get_parameter_value
+
+# @note: The versions conditioning is added here to support the source-compatibility with Humble
+# The `get_parameter_value` function is moved to `rclpy.parameter` module from `ros2param.api` module from version 3.6.0
+try:
+    from rclpy.parameter import get_parameter_value
+except ImportError:
+    from ros2param.api import get_parameter_value
 from rclpy.signals import SignalHandlerOptions
 from ros2param.api import call_set_parameters