Upgrade to Apache PdfBox 2.0.37 and Build modernization - #591

Timeout waiting for emulator to boot.

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-java@v3.11.0. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/