qrencode: 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/qrencode/versions.

These checks were done:

- built on NixOS
- /nix/store/cywxaw8h01kh5rvkhx7bh2738icds31s-qrencode-4.0.2/bin/qrencode 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 4.0.2 with grep in /nix/store/cywxaw8h01kh5rvkhx7bh2738icds31s-qrencode-4.0.2
- directory tree listing: https://gist.github.com/93c7bac0fe3aae76a9ef5ebbd9fba7de
- du listing: https://gist.github.com/2b0d6fa748528181bfed9cbb453ed75a