libfilezilla: 0.12.1 -> 0.12.2

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

This update was made based on information from https://repology.org/metapackage/libfilezilla/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 0.12.2 with grep in /nix/store/1a0qm1j932zsiysy0hjhs8fvg3hsq6cf-libfilezilla-0.12.2
- directory tree listing: https://gist.github.com/13640dfb6e0ad1f3a5005c8c75cbc6c1