ci: publish Utxorpc.Spec via NuGet trusted publishing - #212

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache/restore@v4, actions/cache/save@v4, actions/checkout@v4, actions/setup-node@v4, actions/upload-artifact@v4, baptiste0928/cargo-install@v2. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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New version for protoc-gen-tonic available: 0.5.0

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New version for protoc-gen-prost-serde available: 0.4.0

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New version for protoc-gen-prost-crate available: 0.5.0

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Failed to restore: Cache service responded with 400