ncmpc: 0.29 -> 0.30

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

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

These checks were done:

- built on NixOS
- ran ‘/nix/store/2cwvc3ps7jd9bkrdkgkmgn48wdk7yyv4-ncmpc-0.30/bin/ncmpc --help’ got 0 exit code
- found 0.30 with grep in /nix/store/2cwvc3ps7jd9bkrdkgkmgn48wdk7yyv4-ncmpc-0.30
- directory tree listing: https://gist.github.com/07b8bd46db7e01426ba82a0e1dd2b0d0