Ensure ECCSI SSK is in [1, q-1]. Fix multiple issues in TI/Xilinx AES. Update base16/64/blake2b documentation. - #11902

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/