atlas: 3.10.2 -> 3.10.3

Semi-automatic update generated by https://github.com/ryantm/nix-update tools. 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/79z1zd6ydm6b7x6xbf8b908iirah8hqn-atlas-3.10.3