Upgrade runtime from node20 to node24 - #34

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, github/codeql-action/analyze@4fa2a7953630fd2f3fb380f21be14ede0169dd4f, github/codeql-action/autobuild@4fa2a7953630fd2f3fb380f21be14ede0169dd4f, github/codeql-action/init@4fa2a7953630fd2f3fb380f21be14ede0169dd4f, step-security/harden-runner@17d0e2bd7d51742c71671bd19fa12bdc9d40a3d6. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/