MAINT - Pre release docs and improvements

[trallard]

Description

THis PR adds miscellaneous improvements to prepare the repo for a release:

• :pushpin: Pin Docker base images
• :wrench: Update pyproject.toml
• :memo: Update release docs
• :construction_worker: Update GH actions
• :memo: Finish docs

Pull request checklist

• [x] Did you test this change locally?
• [x] Did you update the documentation (if required)?
• [ ] Did you add/update relevant tests for this change (if required)?

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