Bugfix release: dependencies of pkgs

So far, we put the dependencies of any program you had imported via nixpkgs.packages or a flake into the /bin of the created container.

This creates issue where one of these dependencies might shadow something you're explicitly pulling in via flake.

With this release, that's a thing of the past. If your flaked program needs to find other programs at run time, wrap it with makeWrapper or such.
The bin in the container is just what you requested.

(1.15.4 fixed a bug in 1.15.3 where flake-imported packages were not correctly placed in bin. 1.15.3 was de-released)
(1.15.3 fixed a regression in 1.15.2 for R packages. 1.15.2 was therefore de-released).