Bump ruamel-yaml from 0.18.3 to 0.18.4 #627

Job	Run time
generate	18s
docker (ros, noetic, base)	3m 6s
docker (ros, noetic, dev)	2m 35s
docker (ros, noetic, full)	5m 7s
docker (ros, noetic, gazebo)	7m 33s
docker (ros2, iron, base)	2m 1s
docker (ros2, iron, dev)	3m 8s
docker (ros2, iron, full)	3m 21s
docker (ros2, iron, gazebo)	4m 55s
docker (ros2, iron-cuda, base)	2m 30s
docker (ros2, iron-cuda, dev)	3m 1s
docker (ros2, iron-cuda, full)	3m 30s
docker (ros2, iron-cuda, gazebo-nvidia)	4m 33s
docker (ros2, humble, base)	1m 16s
docker (ros2, humble, dev)	2m 58s
docker (ros2, humble, full)	3m 49s
docker (ros2, humble, gazebo)	4m 20s
docker (ros2, humble-cuda, base)	2m 17s
docker (ros2, humble-cuda, dev)	3m 21s
docker (ros2, humble-cuda, full)	4m 12s
docker (ros2, humble-cuda, gazebo-nvidia)	4m 33s
docker (gazebo, gazebo11, base)	2m 32s
docker (gazebo, gazebo11, dev)	4m 50s
docker (gazebo, gazebo11, nvidia)	43s
docker (ignition, fortress, base)	5m 13s
docker (ignition, fortress, dev)	4m 48s
docker (ignition, fortress, nvidia)	5m 2s
docker (ignition, citadel, base)	2m 27s
docker (ignition, citadel, dev)	3m 3s
docker (ignition, citadel, nvidia)	3m 46s
docker (gz, garden, base)	2m 26s
docker (gz, garden, dev)	4m 21s
docker (gz, garden, nvidia)	2m 42s
docker (gz, garden, nvidia-dev)	5m 10s
complete	1s
	1h 59m 28s

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