The hosted runner lost communication with the server. Anything in your workflow that terminates the runner process, starves it for CPU/Memory, or blocks its network access can cause this error.

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: ruby/setup-ruby@ab177d40ee5483edb974554986f56b33477e21d0. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/