chore: bump burrito

[mhanberg]

Bumping burrito to v1.4 supports a new URL scheme for the beam machine,
which is the CDN that burrito pulls OTP builds from from darwin and
linux

[mhanberg]

I realized that CI was not correctly linting, etc. So i did a number of things

• fixed some dependency things. we were setting the env of the path depencencies, which was causing some test only deps to not get installed
• after fixing the above, there were some forge test utils that had to get moved into lib
• there were some unused deps in the lockfiles, removed those with mix deps.unlock --unused
• changed the ci workflow to use just, and correctly runs the right commands
• changes the workflow to run each lint/test for each project separately. I think will help narrow down when tests are failing, which project they're coming from.
• this also fixes some deps caching issues i noticed
• it does create a gillion jobs, but not really a big deal.
• moves the matrix to a json file, which is created via an elixir script
• updated the justfile to make it easy to run anything in any project just mix forge deps.get just mix expert credo --strict etc
  • I am wondering if trying out something like https://github.com/sportradar/elixir-workspace is worth trying out

There is still a dialyzer issue that is now being reported since the test utils are now in lib, will fix those tomorrow.