docker-compose deprecated args

[pabamato]

Is your enhancement related to a problem? Please describe. Getting a deprecated message related to the docker-compose file

The docker-compose.yml file has the following:

networks:
  wplocaldocker:
    external:
      name: wplocaldocker
volumes:
  wplocaldockerCache:
    external:
      name: wplocaldockerCache

Describe the solution you'd like

Update the syntaxis as per the official docs: https://docs.docker.com/compose/networking/#use-a-pre-existing-network

networks:
  wplocaldocker:
    external: true
    name: wplocaldocker
volumes:
  wplocaldockerCache:
    external: true
    name: wplocaldockerCache

Additional context Getting a deprecated message when running a wp-cli command:

[tylercherpak]

linking to #265

This should be resolved in the next version.