fix: add _aes attribute to Fernet256 for cryptography>=50.0.0 compatibility - #16654

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, actions/setup-python@v5, andymckay/labeler@e6c4322d0397f3240f0e7e30a33b5c5df2d39e90. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/