[edx-platform codejail sandbox] Prepare for Python 3.11

[kdmccormick]

Tasks (incomplete list)

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1. feat!: expose per-release edx-sandbox dependency pins #34509
   +0
2. docs: add python38->311->312 details to edx-sandbox readme #34632
   +0
3. Update named release docs to explain that releases/RELEASE.txt needs to be copied right before each cut
4. Ensure that those ^ instructions are followed for Redwood, so that we have releases/redwood.txt by May 9
5. Ensure that the release notes explain the edx-sandbox upgrade

Notes

• The last release with 2 codejail requirements files was Maple: https://github.com/openedx/edx-platform/tree/open-release/maple.3/requirements/edx-sandbox
• We will need to coordinate testing with tutor-contrib-codejail maintainers

[kdmccormick]

@feanil @awais-ansari I'll be using this ticket to work on the edx-sandbox/codejail environment upgrade.

Do we want a new requirements file for 3.11, 3.12, or both?

EDIT: we decided to have release-based pin files, explained by these new docs: #34632

[kdmccormick]

@feanil , I updated the task list for this ticket. Can you review the docs PR linked in the description? Once that merges, I can handle the remaining items as part of the Redwood cut+release process.

[feanil]

Done, that PR is reviewed and approved with some suggestions.