fix(bridge): discover non-standard block lists in _enumerate_blocks - #1855

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@v4, actions/checkout@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Failed to save: Unable to reserve cache with key setup-uv-2-x86_64-unknown-linux-gnu-ubuntu-24.04-3.12-pruned-3f7ec8042fa045286b0a074daad3de849af1d0fd4e47370b24d1daca3d727fe8, another job may be creating this cache.