Nixpkgs-multiverse: every version that ever existed

I got really excited when Farid showed me this!

He has fixed the oldest and most upvoted issue on devenv: https://github.com/cachix/devenv/issues/16

Basic example in devenv:

  { multiverse, ... }: {
    packages = [
      multiverse.cmake."3.16.5"
      multiverse.bun."0.7.0"
    ];
  }

Docs: https://devenv.sh/pinning/#pinning-an-individual-package-ver...