[openstreetmap/openstreetmap-website] Remove obsolete element from docker-compose.yml (PR #5743)

[Máté Gyöngyösi]

### Description

The 'version' top-level Docker Compose element is deprecated since April 2024: https://github.com/docker/docs/commit/007ac90154c05f34045f607631b93a95c81d4807#diff-948ba582fe1c0dd6e8a5446ed8d8831e8ff65d0df7552f0eaa22b9ff7945b3e3R7

### How has this been tested?

On my Mac using the latest Docker Desktop app. I got no warnings and it still builds successfully!

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5743

-- Commit Summary --

  * Remove obsolete element from docker-compose.yml

-- File Changes --

    M docker-compose.yml (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5743.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5743.diff

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