Planned change: upgrade repo2docker default Python to 3.10 (and other potential upgrades)

There’s an issue open on the Repo2docker repository to bump the default Python version from 3.7 (end of life Jun 2023) to 3.10. This will affect https://mybinder.org and anything else using repo2docker.

This will only affect repositories that don’t pin the Python version. If you’ve got any input on whether this is a good or bad idea, or on how best to gather feedback and to communicate this change to others, please feel free to comment on that issue.

There’s a separate issue for long-term planning of other end-of-life dependencies, such as Ubuntu 18.04 (EOL April 2023) which is the current base image in repo2docker:

Again, any input from the communitry is welcome!

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