qtbitcointrader: 1.40.23 -> 1.40.30

* qtbitcointrader: 1.40.23 -> 1.40.30 (#52077)

Semi-automatic update generated by
https://github.com/ryantm/nixpkgs-update tools. This update was made
based on information from
https://repology.org/metapackage/qtbitcointrader/versions

* qtbitcointrader: cleanup
use fetchzip on GitHub archive tarball