Are you sure the image exists? My guess is that you followed an old tutorial or documentation and assumed the images are never deleted. It looks like this was deleted, because it is mentioned in an old documentation
This was for v2.15.0, but they have much newer versions.
Here is the new documentation
so you can build your image from the latest version, but they deleted the hosted image from Docker Hub. If you think this could be a mistake, ask the maintainer on GitHub what happened to the old images.