chore(windows): no --parallel on build

[lemeurherve]

This change removes the parallel docker compose argument as it seems it wasn't properly configured since the beginning (no amount specified cf https://docs.docker.com/reference/cli/docker/compose/#configuring-parallelism), and did not result in any gain, but instead seems the cause of Windows builds stucks at the end of the build without any obvious error or cause. (cf multiple releases replayed)

Similar to:

• chore(windows): no --parallel on build docker-agents#1179
• chore(windows): no --parallel on build docker-ssh-agent#623

Testing done

CI

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[dduportal]

https://docs.docker.com/reference/cli/docker/compose/#configuring-parallelism: this flag would have required an argument. But which value?

Since it has no performance gain but generate random issues, LGTM!