fix(launcher): preserve native SFT recipes in CI - #6404

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@11d5960a326750d5838078e36cf38b85af677262. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Summary report available at: https://github.com/NVIDIA-NeMo/Megatron-Bridge/actions/runs/38008427143#summary-114082539108