pagemon: 0.01.12 -> 0.01.13

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

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

These checks were done:

- built on NixOS
- /nix/store/i6bq7x5lbw83spjs8irjihvrr09ygkif-pagemon-0.01.13/bin/pagemon 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 0.01.13 with grep in /nix/store/i6bq7x5lbw83spjs8irjihvrr09ygkif-pagemon-0.01.13
- directory tree listing: https://gist.github.com/b7b92de7a71b30515369214111f387e0
- du listing: https://gist.github.com/257db82673b5cf4032834d2d9a93b431