Blackrock: fix OverflowError reading .nev files over 4 GiB - #1929

Process completed with exit code 1.

could not resolve ephy_testing_data HEAD on gin; refusing to build a degenerate cache key

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/