feat(multisrc): skip sources marked down - #2757

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, actions/setup-node@v4, tj-actions/changed-files@v45. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Input 'fail_on_error' has been deprecated with message: Deprecated, use `fail_level` instead.