Update FFmpeg to 9.0.2, build own OpenSSL on manylinux_2_28, Docker images 20261111 in 5.x - #1289

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