feat: Remove deprecated version field from docker-compose files

[timmc-edx]

This was causing docker-compose to print warnings on every operation:

WARN[0000] /home/timmc/edx-repos/devstack/docker-compose.yml: the attribute `version` is obsolete, it will be ignored, please remove it to avoid potential confusion 
WARN[0000] /home/timmc/edx-repos/devstack/docker-compose-host.yml: the attribute `version` is obsolete, it will be ignored, please remove it to avoid potential confusion 
WARN[0000] /home/timmc/edx-repos/devstack/docker-compose-themes.yml: the attribute `version` is obsolete, it will be ignored, please remove it to avoid potential confusion 
WARN[0000] /home/timmc/edx-repos/devstack/docker-compose-watchers.yml: the attribute `version` is obsolete, it will be ignored, please remove it to avoid potential confusion 

https://github.com/compose-spec/compose-spec/blob/main/spec.md#version-top-level-element-obsolete

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I've completed each of the following or determined they are not applicable:

• Made a plan to communicate any major developer interface changes (or N/A)

[timmc-edx]

Weird unrelated provisioning error in registrar+lms... maybe related to that one we were seeing in analytics. Both had a missing package.