Use node20 in action.

[csasarak]

GHA is deprecating Node 16 in spring 2024. This updates our action to run using Node 20.

[meghfossa]

@csasarak - Is there a way to test changes? I'm presuming this would apply to all end users depending on this action currently?

[csasarak]

@meghfossa I think it would only if they were using main and not pinning a released version. The workflow that ran on this PR runs the action several times with different options. Can you say more about what you mean with "test changes"?

[meghfossa]

@meghfossa I think it would only if they were using main and not pinning a released version. The workflow that ran on this PR runs the action several times with different options. Can you say more about what you mean with "test changes"?

I misread the PR - this is only changing the "Github action node", not the node version, when users use GH Action. ✅