Fix nmos-cpp-registry and nmos-cpp-node startup without config JSON - #499

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v3, actions/upload-artifact@v4, ilammy/msvc-dev-cmd@v1, lukka/get-cmake@v3.28.3, lukka/run-cmake@v3.4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

unreachable code

unreachable code

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