Update docker-compose.yml to remove version obsolete warning

[derek-palmer]

Proposal to remove version: syntax in docker-compose.yml. If left in, it throws an obsolete warning.

This reduces unnecessary warnings/chatter and keeps the code up to current standards. See Version top-level element (obsolete) for reference.

[DevilaN]

Did docker v24 that warns about it got widely spread? If not, then people with older versions of docker would have a problem.
Warning is a bit inconvenient, but error from not having version: in file is no-go.

[derek-palmer]

Compose V1 is no longer supported or maintained. And hasn't received security updated in 3 years.

Compose V2 has been in use/active development for 4 years. V2 supports almost all Compose V1 flags and subcommands as well, it can be used as a drop-in replacement in scripts. I have yet to see this in my personal and professional docker experience of this being an issue.

What does this mean for my projects that use Compose V1?

Version top-level element (obsolete)

docker/compose#11628 (comment)

https://docs.docker.com/compose/intro/history/#introduction