pony-stable: 0.1.2 -> 0.1.3

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

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

These checks were done:

- built on NixOS
- /nix/store/d6b9yh4mbc6g4ysgzzdj4xbi49cy228m-pony-stable-0.1.3/bin/stable passed the binary check.
- 1 of 1 passed binary check by having a zero exit code.
- 0 of 1 passed binary check by having the new version present in output.
- found 0.1.3 with grep in /nix/store/d6b9yh4mbc6g4ysgzzdj4xbi49cy228m-pony-stable-0.1.3
- directory tree listing: https://gist.github.com/b5577bbf57ef8fa733c1e1aee8ab8908
- du listing: https://gist.github.com/c69c238d1ab5c35fba5ade17f912bed5