perf(bbox-worker): refine a multi-document extraction's documents concurrently (26.6.14) - #39

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-python@v5, astral-sh/setup-uv@e58605a9b6da7c637471fab8847a5e5a6b8df081. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/