confuse: 2.7 -> 3.2.1

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

This update was made based on information from https://repology.org/metapackage/confuse/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 3.2.1 with grep in /nix/store/nbr6d47mgzxmmxymjh3rw0yc7il66wks-confuse-3.2.1
- directory tree listing: https://gist.github.com/cc2599089248ae14f15a25547413838b