0.7.4: respend and the re-pin to the toolbox 0.7.5, the tracker 0.2.1 and bsv-rs 0.4.5 (bsv-stack-lean L2 item 2) - #17

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/