Only use `docker compose` instead of `docker-compose`

[adamsachs]

Is your feature request related to a specific problem?

docker-compose is no longer the preferred means of running docker compose functionality - docker compose (lack of hyphen) is. what's more - the minimum version of docker that we're now requiring necessarily includes support for docker compose, so we should be safe to rely on it.

we still have some references to docker-compose hanging around in our nox files, and we also run a check on the docker-compose version. while this may resolve to the same thing as docker compose for developers, depending on a value in their docker settings, there's a chance it doesn't, in which case it will add unneeded confusion and potential issues.

Describe the solution you'd like

• update all references to docker-compose to instead use docker compose
• everything should just work, i think? but obviously, make sure that's the case...

Additional context

this isn't urgent, so if for some reason it's not a no-brainer, then no need to rush it.