Pin GitHub Actions to full-length commit SHAs - #473

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Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: danhellem/github-actions-pr-is-linked-to-work-item@fb4390c034b52fdcf1fe08584aad442eb6c8fbc9. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/