Maintenance: Remove obsolete version field from docker-compose.yml files #415
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The version field has become obsolete and causes warnings to be emitted by docker compose. There was also a mismatch in the versions fields (3.8 vs. 3) which causes issues with Portainer.
https://docs.docker.com/compose/compose-file/04-version-and-name/#version-top-level-element-obsolete