chore(docker-compose): harmonize versions with sw360chores #1508
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The SW360chores docker compose project uses version 3.5. Bumping the version
here has no negative effects (except for probably old distributions having not a
new enough docker-compose, needs Docker Engine 17.12.0+).
The advantage is, that this allows the deployments to work in sync and one can
start both at the same time e.g. via: