qjackctl: 0.5.0 -> 0.5.1

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

This update was made based on information from https://repology.org/metapackage/qjackctl/versions.

These checks were done:

- built on NixOS
- Warning: no invocation of /nix/store/8v1gipr8vnyf6kx68xlxrfkdk226r65q-qjackctl-0.5.1/bin/qjackctl had a zero exit code or showed the expected version
- 0 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 0.5.1 with grep in /nix/store/8v1gipr8vnyf6kx68xlxrfkdk226r65q-qjackctl-0.5.1
- directory tree listing: https://gist.github.com/b33811366209a2de394b82f4c7cec003
- du listing: https://gist.github.com/5cef67561cc5293a1f1a78504bda18c1