Update to Node20 and switch `pkg`

[tegefaulkes]

Specification

There are two parts to this issue.

1. Once again updating to node 20 as it's supported by the packager now.
2. Switch the packager from vercel/pkg to https://github.com/yao-pkg/pkg

Additional context

Related #40 (comment)

Tasks

1. Update to node 20
2. switch to using yao-pkg/pkg for packaging. This includes removing the use of vercel/pkg.

[CMCDragonkai]

When switching to node 20 and the new yao pkg, enable the arm64 builds. It's now available. See: https://github.com/yao-pkg/pkg-fetch/releases

Will need to update utils.nix and .gitlab-ci.yml to produce those builds. Also this infrastructure should be moved to nixpkgs-matrix so we can use it across multiple projects.

[CMCDragonkai]

PK is already on Node 20. This should be part of the #40.

[CMCDragonkai]

Node 20 is LTS since october last year.

[amydevs]

This seems to have already been done.

enable the arm64 builds

We will need to make arm64 builds for the dependencies before this can happen (js-db, js-mdns, etc.)

[CMCDragonkai]

This is done? Where's the PR.

[amydevs]

pretty sure the switch to yao-pkg was done in 2ef4aa9

[amydevs]

ah wait, the environment scripts and the flake still refer to node 18, will switch it over