gibo: 1.0.4 -> 1.0.6

Semi-automatic update. 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 1.0.6 with grep in /nix/store/jk28x9x2szkp8cgfg3x7vmsrjhh4nabs-gibo-1.0.6
- found 1.0.6 in filename of file in /nix/store/jk28x9x2szkp8cgfg3x7vmsrjhh4nabs-gibo-1.0.6