fix(iam): random access key secrets and STS credentials - #1437

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/

432 provider file(s) lack a same-named file under server/<cloud>/ (docs/STRUCTURE.md §3, advisory)