biboumi: 6.1 -> 7.2

Semi-automatic update. These checks were done:

- built on NixOS
- ran `/nix/store/ng1gidmaivbb5ngd4awq6wgraa55yjd5-biboumi-7.2/bin/biboumi --help` got 0 exit code
- found 7.2 with grep in /nix/store/ng1gidmaivbb5ngd4awq6wgraa55yjd5-biboumi-7.2
- found 7.2 in filename of file in /nix/store/ng1gidmaivbb5ngd4awq6wgraa55yjd5-biboumi-7.2