lower required SDL3 version to 3.2.8 - #7876

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: asarium/clang-tidy-action@v1. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/