Update migrate script for new lib dir - #2531

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: OSS-Docs-Tools/code-owner-self-merge@35e0f55671d1cebd7c0a53e199cb3a3a03678c2b. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/