[CT-3184] Node 16 is EOL

[emmyoop]

node 16 is EOL as of 9/6/2023 and is being deprecated by GitHub in 2024. We need to verify we don't use it anywhere and update if we do.

This will require searching all our owned repos. This highest likelihood of use is in workflows with

uses: actions/setup-node

But other uses may be present.

Details: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/