gnubg: 1.04.000 -> 1.06.001

Semi-automatic update. These checks were done:

- built on NixOS
- ran `/nix/store/6r487wa172j7yn39akgn0i1hjp2d8z4g-gnubg-1.06.001/bin/gnubg -h` got 0 exit code
- ran `/nix/store/6r487wa172j7yn39akgn0i1hjp2d8z4g-gnubg-1.06.001/bin/gnubg --help` got 0 exit code
- ran `/nix/store/6r487wa172j7yn39akgn0i1hjp2d8z4g-gnubg-1.06.001/bin/gnubg -v` and found version 1.06.001
- ran `/nix/store/6r487wa172j7yn39akgn0i1hjp2d8z4g-gnubg-1.06.001/bin/gnubg --version` and found version 1.06.001
- ran `/nix/store/6r487wa172j7yn39akgn0i1hjp2d8z4g-gnubg-1.06.001/bin/makebearoff -h` got 0 exit code
- ran `/nix/store/6r487wa172j7yn39akgn0i1hjp2d8z4g-gnubg-1.06.001/bin/makebearoff --help` got 0 exit code
- ran `/nix/store/6r487wa172j7yn39akgn0i1hjp2d8z4g-gnubg-1.06.001/bin/makehyper -h` got 0 exit code
- ran `/nix/store/6r487wa172j7yn39akgn0i1hjp2d8z4g-gnubg-1.06.001/bin/makehyper --help` got 0 exit code
- ran `/nix/store/6r487wa172j7yn39akgn0i1hjp2d8z4g-gnubg-1.06.001/bin/bearoffdump -h` got 0 exit code
- ran `/nix/store/6r487wa172j7yn39akgn0i1hjp2d8z4g-gnubg-1.06.001/bin/bearoffdump --help` got 0 exit code
- found 1.06.001 with grep in /nix/store/6r487wa172j7yn39akgn0i1hjp2d8z4g-gnubg-1.06.001
- found 1.06.001 in filename of file in /nix/store/6r487wa172j7yn39akgn0i1hjp2d8z4g-gnubg-1.06.001