krita: 4.0.0 -> 4.0.1

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 4.0.1 with grep in /nix/store/5n5zy1944sd00lablmvqcqyp4w1b2sy9-krita-4.0.1
- directory tree listing: https://gist.github.com/b46fb0156abdb69233c6f63121457b89