Update to node 20

[ntkme]

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

[nex3]

Thanks!

[ntkme]

@nex3 Since all other repos are referring this repo as @v1, we probably should re-tag v1? Or alternatively we can switch to @main in other repo.

[ntkme]

@nex3 Pinging again as we can still see tons of deprecation warnings on dart-sass CI.

We need to do one of the following:

1. Delete and retag v1 with current commit on main branch.
2. Delete tag v1 and rename branch main to branch v1.
3. Tag v2 and update all other repos with clone-linked-repo@v2.
4. Update all other repos with clone-linked-repo@main.

Any preference?

[ntkme]

Example of warnings: https://github.com/sass/dart-sass/actions/runs/10084621954

[nex3]

Sorry I missed this! I've put out #11 which should avoid this problem in the future.