Document reserved tracking tag in caching guide - #2317

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, actions/create-github-app-token@v1, actions/setup-python@v5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Cache reservation failed: cache write denied: token has no writable scopes

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🔍 Checking PR #2317 by @yuanyouyao...

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[AUTH] ✅ Token Upgrade Successful!