fix loadFile for package.mo: don't copy it out of its package directory - #476

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: szenius/set-timezone@v2.0. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/