Create SECURITY.md - #248

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-java@v4, stCarolas/setup-maven@d6af6abeda15e98926a57b5aa970a96bb37f97d1. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/