asunder: 2.9.2 -> 2.9.3 (#38750)

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

This update was made based on information from https://repology.org/metapackage/asunder/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 2.9.3 with grep in /nix/store/maiwh6l7wa8gyjhx1zlg8l8xwrczszr7-asunder-2.9.3
- directory tree listing: https://gist.github.com/5cfcd566e15079a73ab786533722d002