Pulling for GPU does not work

Thanks for helping us improve this project!

**Before you create this issue**
Please make sure you are using the latest updated code and libraries: see https://github.com/ageron/handson-ml3/blob/main/INSTALL.md#update-this-project-and-its-libraries

Also please make sure to read the FAQ (https://github.com/ageron/handson-ml3#faq) and search for existing issues (both open and closed), as your question may already have been answered: https://github.com/ageron/handson-ml3/issues

**Describe the bug**
Error response from daemon: manifest for ageron/handson-ml3:latest-gpu not found: manifest unknown: manifest unknown

**To Reproduce**
Please copy the code that fails here, using code blocks like this:

```docker pull ageron/handson-ml3:latest-gpu
```