fix(completions): Fix winget custom completions for nu 0.117.0 - #1305

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, hustcer/setup-nu@v3.9. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/