atlas: 3.10.2 -> 3.10.3

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/atlas/versions.

These checks were done:

- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 3.10.3 with grep in /nix/store/bgqampvgm3zdncg3206n7qnvyvl0jipj-atlas-3.10.3
- directory tree listing: https://gist.github.com/a7dd287df10b13796423e3c2df0850eb