znapzend: 0.17.0 -> 0.18.0

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

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

These checks were done:

- built on NixOS
- ran ‘/nix/store/i652pzxzq638dglzqh7p7afp9dilnfsy-znapzend-0.18.0/bin/znapzendzetup help’ got 0 exit code
- ran ‘/nix/store/i652pzxzq638dglzqh7p7afp9dilnfsy-znapzend-0.18.0/bin/znapzendztatz -h’ got 0 exit code
- ran ‘/nix/store/i652pzxzq638dglzqh7p7afp9dilnfsy-znapzend-0.18.0/bin/znapzendztatz --help’ got 0 exit code
- found 0.18.0 with grep in /nix/store/i652pzxzq638dglzqh7p7afp9dilnfsy-znapzend-0.18.0
- directory tree listing: https://gist.github.com/5bc48206cf2caa33654bb891da1fdf99