fix(rendering): keep late camera timestamps in the FFmpeg decoder - #2684

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

crates/rendering/src/decoder/ffmpeg.rs, crates/rendering/src/decoder/model/expectations.toml, crates/rendering/src/decoder/model/mod.rs