pstoedit: 3.70 -> 3.71

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

This update was made based on information from https://repology.org/metapackage/pstoedit/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 3.71 with grep in /nix/store/3lll9l623hg5na4xvb9vbhksq1jp04ax-pstoedit-3.71
- directory tree listing: https://gist.github.com/33d6a65ee820b486f0aaff223832a0d0