build(deps): bump nodemailer from 8.0.11 to 10.0.13 in /backend - #1506

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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@11bd71901bbe5b1630ceea73d27597364c9af683, actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020, actions/upload-artifact@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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