pdd: 1.2 -> 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/pdd/versions.

Version release notes (from GitHub):
## What's in?

- Custom resolution for stopwatch (default - milliseconds)
- Option `-q` (quiet) to run timers in the background
- Show timers in reverse video
- Use ISO 8601 format for dates
- Some Windows-specific fixes

**Note:** the attached auto-generated package for Ubuntu 18.04 has a missing dependency - `python3-dateutil`. It's required but had to be ignored temporarily due to a build failure. Please run:

    sudo apt-get install python3-dateutil
for the package to work correctly after installation.

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These checks were done:

- built on NixOS
- /nix/store/mwv0y87m5x73xslyq4zar4vxxdvfwww7-pdd-1.3/bin/.pdd-wrapped passed the binary check.
- /nix/store/mwv0y87m5x73xslyq4zar4vxxdvfwww7-pdd-1.3/bin/pdd passed the binary check.
- 2 of 2 passed binary check by having a zero exit code.
- 0 of 2 passed binary check by having the new version present in output.
- found 1.3 with grep in /nix/store/mwv0y87m5x73xslyq4zar4vxxdvfwww7-pdd-1.3
- directory tree listing: https://gist.github.com/0848d82c6dddf60c43205c10b360df35
- du listing: https://gist.github.com/c2d9c78b7020ca61bd818ab1ac43ab93