help2man: 1.47.5 -> 1.47.6

Semi-automatic update. These checks were done:

- built on NixOS
- ran `/nix/store/3qw4v9wzqzk8kljaln8r0p7s0g8msyj2-help2man-1.47.6/bin/help2man --help` got 0 exit code
- ran `/nix/store/3qw4v9wzqzk8kljaln8r0p7s0g8msyj2-help2man-1.47.6/bin/help2man --version` and found version 1.47.6
- found 1.47.6 with grep in /nix/store/3qw4v9wzqzk8kljaln8r0p7s0g8msyj2-help2man-1.47.6
- found 1.47.6 in filename of file in /nix/store/3qw4v9wzqzk8kljaln8r0p7s0g8msyj2-help2man-1.47.6