Remove version element in Docker Compose files

[brfrn169]

Description

This PR removes the version element in Docker Compose files since it's obsolete. This was discussed in the comment #65 (comment).

Related issues and/or PRs

N/A

Changes made

• Removed the version element in Docker Compose files.

Checklist

• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation to reflect the changes.
• Any remaining open issues linked to this PR are documented and up-to-date (Jira, GitHub, etc.).
• Tests (unit, integration, etc.) have been added for the changes.
• My changes generate no new warnings.
• Any dependent changes in other PRs have been merged and published.

Additional notes (optional)

N/A

[kota2and3kan]

LGTM! Thank you!

[Torch3333]

LGTM, thank you!

[feeblefakie]

LGTM! Thank you!