This brings an important security improvement -- codejail won't default to
running in unsafe mode, which can happen if certain configuration errors
are present.
Properly configured installations shouldn't be affected. We just need to
adjust some unit tests to opt into unsafe mode.
Changes:
- Update `edx-codejail` dependency to [version 4.0.0](https://github.com/openedx/codejail/blob/master/CHANGELOG.rst#400---2025-06-13)
- Define a `use_unsafe_codejail` decorator that allows running a unit test (or entire TestCase class) in unsafe mode
- Use that decorator as needed, based on which tests started failing
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