pqiv: 2.10.3 -> 2.10.4

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

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

These checks were done:

- built on NixOS
- ran ‘/nix/store/80y2wx9ga0c647w0m0nhkx2hgfhnwpv5-pqiv-2.10.4/bin/pqiv -h’ got 0 exit code
- ran ‘/nix/store/80y2wx9ga0c647w0m0nhkx2hgfhnwpv5-pqiv-2.10.4/bin/pqiv --help’ got 0 exit code
- ran ‘/nix/store/80y2wx9ga0c647w0m0nhkx2hgfhnwpv5-pqiv-2.10.4/bin/pqiv help’ got 0 exit code
- found 2.10.4 with grep in /nix/store/80y2wx9ga0c647w0m0nhkx2hgfhnwpv5-pqiv-2.10.4
- directory tree listing: https://gist.github.com/4743505ebdeb4ef63b3c2637f5d6879d