renpy: 6.99.14.2 -> 6.99.14.3

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

This update was made based on information from https://repology.org/metapackage/renpy/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 6.99.14.3 with grep in /nix/store/cjp6nqbn7ni65awiwhdgy6z36vwixpag-renpy-6.99.14.3
- directory tree listing: https://gist.github.com/b6c16d6f78583a3c4c384e043a57b07d