That is maintained by the distribution maintainers and the official documentation of Docker starts with the command to remove it. That package is supported by the maintainers of the distribution.
Since you opened the topic I had to realize that when you delete an image you built, it goes to the build cache. So when you run docker system df you see the size of the sum of images decrease, and at the same time the size of the cache increase. Since docker system prune and docker builder prune can delete the cache, but docker image prune deletes only images, it could explain why you didn’t see reclaimed space.