Bump acorn from 8.11.3 to 8.12.0 #14716

Job	Run time
Don't run scheduled jobs on forks	1s
Test ROS 2 packages in repository (macOS-latest, humble)	5m 42s
Test ROS 2 packages in repository (macOS-latest, iron)	4m 46s
Test ROS package (noetic)	1m 51s
Test ROS 2 packages in repository (macOS-latest, jazzy)	4m 53s
ROS 2 Docker (humble)	3m 45s
Test ROS 2 packages in repository (windows-2019, humble)	6m 30s
ROS 2 from source (ubuntu:22.04, humble)	9m 55s
Test ROS 2 packages in repository (windows-2019, iron)	9m 16s
ROS 2 Docker (iron)	3m 58s
ROS 2 from source (ubuntu:22.04, iron)	11m 28s
Test ROS 2 from source Docker (humble)	17m 39s
Test ROS 2 packages in repository (windows-2019, jazzy)	12m 31s
ROS 2 Docker (jazzy)	4m 8s
ROS 2 from source (ubuntu:24.04, jazzy)	14m 25s
Test ROS 2 from source Docker (iron)	19m 26s
ROS 2 Docker (rolling)	4m 1s
ROS 2 from source (ubuntu:24.04, rolling)	13m 58s
Test ROS 2 from source Docker (jazzy)	22m 51s
Test ROS 2 humble package with ROS dependencies	4m 57s
ROS 2 from source (windows-2019, humble)	17m 22s
Test ROS 2 from source Docker (rolling)	22m 4s
Test with rosdep-skip-keys option	6m 31s
ROS 2 from source (windows-2019, iron)	18m 19s
ROS 2 from source (windows-2019, jazzy)	19m 37s
Test rosdep check/skip install options	1m 45s
ROS 2 from source (windows-2019, rolling)	17m 20s
ROS 2 from source (macOS-latest, humble)	16m 19s
Test with private repos	5m 29s
ROS 2 from source (macOS-latest, iron)	15m 50s
ROS 2 from source (macOS-latest, jazzy)	14m 28s
ROS 2 from source (macOS-latest, rolling)	15m 26s
	5h 46m 31s

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