docker: Bump compose file format version to 2.1

rDENV5db372fc introduced the use of the healthcheck feature from docker-compose.

The healtcheck feature was introduced with version 2.1 of the Compose file format.

So bump Compose file format version to 2.1 in compose files in order to avoid the following error when using docker-compose < 1.27:

"depends_on contains an invalid type, it should be an array"

Related to !91 (closed)

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Migrated from D5097 (view on Phabricator)

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