babeld: 1.8.0 -> 1.8.1

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

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

These checks were done:

- built on NixOS
- ran ‘/nix/store/j81blmvh73cbd6ymkg6z25gb9nx2ilks-babeld-1.8.1/bin/babeld -V’ and found version 1.8.1
- found 1.8.1 with grep in /nix/store/j81blmvh73cbd6ymkg6z25gb9nx2ilks-babeld-1.8.1
- directory tree listing: https://gist.github.com/9ced26cbfac7f25e450f058f63c0f209