krita: 4.0.1 -> 4.0.2

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

This update was made based on information from https://repology.org/metapackage/krita/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 4.0.2 with grep in /nix/store/frfrgq3pkda5hjpgjzm6bw9b1zp8c575-krita-4.0.2
- directory tree listing: https://gist.github.com/dc5ab15c03d296eeef4134cf33666c30