hwinfo: 21.55 -> 21.56

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/hwinfo/versions.

These checks were done:

- built on NixOS
- /nix/store/vdfyjf4l15gl2mqav1239p3324nxc1cx-hwinfo-21.56/bin/hwinfo passed the binary check.
- /nix/store/vdfyjf4l15gl2mqav1239p3324nxc1cx-hwinfo-21.56/bin/check_hd passed the binary check.
- Warning: no invocation of /nix/store/vdfyjf4l15gl2mqav1239p3324nxc1cx-hwinfo-21.56/bin/mk_isdnhwdb had a zero exit code or showed the expected version
- Warning: no invocation of /nix/store/vdfyjf4l15gl2mqav1239p3324nxc1cx-hwinfo-21.56/bin/convert_hd had a zero exit code or showed the expected version
- /nix/store/vdfyjf4l15gl2mqav1239p3324nxc1cx-hwinfo-21.56/bin/getsysinfo passed the binary check.
- 3 of 5 passed binary check by having a zero exit code.
- 1 of 5 passed binary check by having the new version present in output.
- found 21.56 with grep in /nix/store/vdfyjf4l15gl2mqav1239p3324nxc1cx-hwinfo-21.56
- directory tree listing: https://gist.github.com/b9d5b7de5962022ef010b2d4f42810c1
- du listing: https://gist.github.com/1d6be034568191041d6d6c11b601a8e9