Update github workflows to use Node 20

[dotNomad]

Now that VSCode is on Node 20 due its bump to Electron 29, we should use Node 20 in our Github Workflows.

Intent

Part of #1206

Type of Change

• • [ ] Bug Fix
• • [ ] New Feature
• • [ ] Breaking Change
• • [ ] Documentation
• • [ ] Refactor
• • [x] Tooling