Update GitHub Actions workflows to use Node 22

[rzhao271]

Request

Please update all GitHub Actions workflows in this repository to use Node 22.

Why

Some workflows currently run on Node versions older than 20. We should standardize on Node 22 for security, supportability, and consistency.

Scope

• Update .github/workflows/* jobs that use actions/setup-node to node-version: 22 (or equivalent matrix value including 22 where appropriate).
• Ensure no workflow remains pinned to Node <20.
• Keep workflow behavior unchanged otherwise.

Validation

• All workflow YAML files reference Node 22 (or matrix includes 22 where intended).
• CI remains green after the change.

Thanks!