bzflag: 2.4.12 -> 2.4.14

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

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

These checks were done:

- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 2.4.14 with grep in /nix/store/z93gp3xa0spbywriag5pg04k2yy8jy3z-bzflag-2.4.14
- directory tree listing: https://gist.github.com/b4b3a993ddc5d7c26bb2c23aad53029c