lasso: 2.5.1 -> 2.6.0

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

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

These checks were done:

- built on NixOS

- 0 of 0 passed binary check by having a zero exit code.
- 0 of 0 passed binary check by having the new version present in output.
- found 2.6.0 with grep in /nix/store/2l3v2ybw0d8i93jw1prz6gy8286sgk4h-lasso-2.6.0
- directory tree listing: https://gist.github.com/9c856166c934c662528486068343a94b
- du listing: https://gist.github.com/30bc3e59b3d6dd6dd2d45e467b955e1a