pspg: 1.1.0 -> 1.1.1

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

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

These checks were done:

- built on NixOS
- ran ‘/nix/store/g5s0d7h461nd55hnzp5k6v74dlfcz6dh-pspg-1.1.1/bin/pspg --help’ got 0 exit code
- ran ‘/nix/store/g5s0d7h461nd55hnzp5k6v74dlfcz6dh-pspg-1.1.1/bin/pspg -V’ and found version 1.1.1
- ran ‘/nix/store/g5s0d7h461nd55hnzp5k6v74dlfcz6dh-pspg-1.1.1/bin/pspg --version’ and found version 1.1.1
- found 1.1.1 with grep in /nix/store/g5s0d7h461nd55hnzp5k6v74dlfcz6dh-pspg-1.1.1
- directory tree listing: https://gist.github.com/ba99487fab26f86a314d4a727749a490