chore(utilities): bump vane image tag → main

Summary

Bumps Vane from the feature-branch image (`feat-model-select-and-defaults`) to the project default-branch build (`main`). The fork's GitLab CI publishes a `main` tag on every push to main, so this tracks "current stable" without pinning to a SHA.

Deploy

```bash ansible-playbook deploy/utilities.yml ```

Compose will pull the new image and recreate the Vane container.