Rename PushRosNamespace to PushROSNamespace (ros-navigation#3763)

Author: Tony Najjar

nav2_bringup/launch/bringup_launch.py

@@ -23,7 +23,7 @@
 from launch.launch_description_sources import PythonLaunchDescriptionSource
 from launch.substitutions import LaunchConfiguration, PythonExpression
 from launch_ros.actions import Node
-from launch_ros.actions import PushRosNamespace
+from launch_ros.actions import PushROSNamespace
 from launch_ros.descriptions import ParameterFile
 from nav2_common.launch import RewrittenYaml
 
@@ -113,7 +113,7 @@ def generate_launch_description():
 
     # Specify the actions
     bringup_cmd_group = GroupAction([
-        PushRosNamespace(
+        PushROSNamespace(
             condition=IfCondition(use_namespace),
             namespace=namespace),