chore(deps-dev/backend): bump @nestjs/testing from 11.0.12 to 12.2.0 in /backend - #881

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Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332, actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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