chore(deps): libjbytecode/libgarena 全退役，libjbc 抬 0.4.19（RFC 0002 B8 8.7 下游收口） - #22

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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/cache@v4, actions/checkout@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/