Compose version property is obsolete

[kdmccormick]

Bug description

As mentioned here, docker-compose now warns of a deprecated property

/home/tutor/.local/share/tutor/env/local/docker-compose.yml: `version` is obsolete
/home/tutor/.local/share/tutor/env/local/docker-compose.prod.yml: `version` is obsolete
/home/tutor/.local/share/tutor/env/local/docker-compose.jobs.yml: `version` is obsolete

How to reproduce

Run any tutor command that invokes docker-compose. tutor local run lms bash would work.

Environment

Python 3.10.12
Compose v1.29.2 (should work with newer versions, too)

Recommended Fix

The version property of Compose .yml files is obsolete as of 1.27 and should be removed, as described in official compose spec):

Legacy versions 2.x and 3.x of the Compose file format were merged into the Compose Specification. It is implemented in versions 1.27.0 and above (also known as Compose V2) of the Docker Compose CLI.

and again:

The top-level version property is defined by the Compose Specification for backward compatibility. It is only informative and you'll receive a warning message that it is obsolete if used.

Tutor recommends docker-compose>=2.0.0, so we should be plenty safe to remove remove this property from all compose files. Furthermore, Tutor's DOCKER_COMPOSE_VERSION config setting is only used to set the obsolete version property, and overriding that config version never would have been viable for end-users anyway, so I recommend removing the config setting too.

[jasonmokk]

Hello, I'd like to work on this issue.

[kdmccormick]

Great @jasonmokk , it's all yours! Let me know if you need any help getting started.