libsixel: 1.7.3 -> 1.8.1
libsixel: 1.7.3 -> 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/libsixel/versions.

These checks were done:

- built on NixOS
- /nix/store/ik92zw2fv4xpgnyrqj7aqyck2zzvxva5-libsixel-1.8.1/bin/img2sixel passed the binary check.
- /nix/store/ik92zw2fv4xpgnyrqj7aqyck2zzvxva5-libsixel-1.8.1/bin/sixel2png passed the binary check.
- /nix/store/ik92zw2fv4xpgnyrqj7aqyck2zzvxva5-libsixel-1.8.1/bin/libsixel-config passed the binary check.
- 3 of 3 passed binary check by having a zero exit code.
- 1 of 3 passed binary check by having the new version present in output.
- found 1.8.1 with grep in /nix/store/ik92zw2fv4xpgnyrqj7aqyck2zzvxva5-libsixel-1.8.1
- directory tree listing: https://gist.github.com/12d77ba43524f986a70f71b8e6f1714e
- du listing: https://gist.github.com/9642634786b1c4b8f9c5396f7d8c02cd

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