- Upgrade actions/checkout from v4 to v7
- Upgrade actions/setup-dotnet from v4 to v5
- Upgrade actions/upload-artifact from v4 to v7
- Upgrade actions/download-artifact from v4 to v4 (already compatible)
- Upgrade ncipollo/release-action from v1 to v1.21.0
This addresses GitHub's deprecation of Node.js 20 and the upcoming
forced migration to Node.js 24 (effective June 2, 2026).