xkeyboard_config: 2.22 -> 2.23.1

Semi-automatic update generated by https://github.com/ryantm/nix-update tools. 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 2.23.1 with grep in /nix/store/rzna96awj2li59rvgpk0ib40bj0jx8xx-xkeyboard-config-2.23.1
- directory tree listing: https://gist.github.com/6c094cb77d9d6e1110bc5d44144a55ba